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Monitor Won't Turn On After Installing Noctua NH-D14 Cooler and Fractal Design Core 3000

Dalager 122993 34
Best answers

Why does my PC turn on after moving it to a new case and installing a new CPU cooler, but the monitor stays black?

The PC was likely not mounted correctly or the motherboard was shorting against the case; in this thread, removing the motherboard, cleaning it, and screwing it back in fixed the problem [#10314032] Before that, the best checks were to verify the GPU is fully seated and powered, and to make sure the extra 4-pin CPU power connector from the PSU is plugged in [#10305238][#10305413] Another good test was to run the system outside the case with only the motherboard, CPU, PSU, and speaker, then clear CMOS and see whether it beeps when RAM or the graphics card is missing [#10306380] Short repeated beeps without RAM suggested the board and CPU were at least alive, which pointed away from the processor and toward RAM or motherboard seating/power issues [#10310370][#10310606][#10310826]
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  • #1 10305163
    Dalager
    Level 9  
    Posts: 13
    Rate: 10
    Hello. My problem started when I got a CPU cooler for Christmas called Noctua NH-D14 and a case called Fractal Design Core 3000 Black. When I moved all the parts from the old housing to the new one and replaced the fan for the processor, I wanted to turn it on and suddenly everything works in the computer and the monitor does not turn on and I know that it works. I will provide my computer parameters below.

    Procek - AMD Phenom X4 955 Black Edition
    Motherboard - ASUS M4A79XTD EVO
    graphics card - Geforce GTS 250
    Power supply - Chiefteg A80 500W
    Ram - Kingston 2x 4 gb

    thanks in advance.
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  • #2 10305238
    kdvc
    Level 24  
    Posts: 573
    Help: 73
    Rate: 165
    Correct the video card in the connector.
    Check that you have connected its power and that the cable from the card is properly inserted.
  • #3 10305388
    Dalager
    Level 9  
    Posts: 13
    Rate: 10
    I put the card in and laid it out three times so I know that it is surely well connected.
  • #4 10305413
    rafal13452
    Level 10  
    Posts: 45
    Rate: 9
    Check if the plugs from the power supply are properly connected and do not forget about the additional 4 Pins.
    Did you take out the CPU, Memory ??
  • #5 10305952
    Bartusjusz
    Level 25  
    Posts: 972
    Help: 63
    Rate: 84
    What does it mean, the monitor won't turn on?
    If you connect only the power to the monitor and press the button, it doesn't turn on either?
  • #6 10306195
    Dalager
    Level 9  
    Posts: 13
    Rate: 10
    rafal13452 wrote:
    Check if the plugs from the power supply are properly connected and do not forget about the additional 4 Pins.
    Did you take out the CPU, Memory ??

    I checked everything, I also took out the processor by accident because I wanted to remove the fan and put it on again and the processor stuck to the heat sink and with the hair dryer I had to heat the paste to take it off maybe I could damage something but I doubt it. I also took out the Ram as well as hard drives and a graphics card.
    I know that I connected everything well.

    Added after 2 [minutes]:

    Bartusjusz wrote:
    What does it mean, the monitor won't turn on?
    If you connect only the power to the monitor and press the button, it doesn't turn on either?

    1. The point is that when I start the computer, the computer turns on and the monitor does not.
    2.As I connect only the power to the monitor, it also does not turn on.
  • #7 10306230
    rafal13452
    Level 10  
    Posts: 45
    Rate: 9
    Hymm try to pull out the processor and check if the feet are straight then
    Put it back on the socket (when closing the socket latch, press the processor)
    Then turn on the computer and check if the processor gets warm, then turn it off and attach the Heatsink.
  • #8 10306238
    Dalager
    Level 9  
    Posts: 13
    Rate: 10
    I would like to add that the red diode is not on and does not even flash once, and I think it should flash from time to time.
  • #9 10306252
    rafal13452
    Level 10  
    Posts: 45
    Rate: 9
    And when you take out the RAM, the board makes some sounds?

    Added after 2 [minutes]:

    Dalager wrote:
    I would like to add that the red diode is not on and does not even flash once, and I think it should flash from time to time.


    What diode are you talking about ??
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  • #10 10306270
    Dalager
    Level 9  
    Posts: 13
    Rate: 10
    rafal13452 wrote:
    Hymm try to pull out the processor and check if the feet are straight then
    Put it back on the socket (when closing the socket latch, press the processor)
    Then turn on the computer and check if the processor gets warm, then turn it off and attach the Heatsink.

    Today, when I connected it again, I checked if the legs were bent and they were straight and I pressed the processor and closed the latch, but I did not check if the processor was warm, so I will try to check it tomorrow.

    Added after 1 [minutes]:

    rafal13452 wrote:
    And when you take out the RAM, the board makes some sounds?

    Added after 2 [minutes]:

    Dalager wrote:
    I would like to add that the red diode is not on and does not even flash once, and I think it should flash from time to time.


    What diode are you talking about ??

    The LED from the HDD led what is on the top of the computer case.
    Tomorrow I will check everything because today I do not want to combine with this frame and the processor, tomorrow I will describe everything to you.
  • #11 10306312
    rafal13452
    Level 10  
    Posts: 45
    Rate: 9
    Also check if the board can sound without RAM.

    This diode is not very important, it is best to disconnect all unnecessary devices, e.g. the DVD hard drive (also remove the braces from the disc) and check the disc itself if the image shows.

    Maybe you just connected the DVD harness wrong and the picture will not show, I had such a case before.
  • #12 10306356
    Bartusjusz
    Level 25  
    Posts: 972
    Help: 63
    Rate: 84
    Dalager wrote:


    Added after 2 [minutes]:

    Bartusjusz wrote:
    What does it mean, the monitor won't turn on?
    If you connect only the power to the monitor and press the button, it doesn't turn on either?

    1. The point is that when I start the computer, the computer turns on and the monitor does not.
    2.As I connect only the power to the monitor, it also does not turn on.



    So, you probably have a damaged monitor, but such a coincidence that when replacing the processor cooling ...
  • #13 10306380
    Dj Haker

    Level 35  
    Posts: 2927
    Help: 322
    Rate: 99
    Take the CD out on the desk. Perform a CMOS reset.

    Run in the configuration: motherboard, processor, power supply, speaker and check if it signals the lack of memory and / or graphics card. If so, add components.

    Don't forget to connect additional power to the CPU.
    It is possible that the motherboard is short-circuited or damaged. Check to see if you accidentally broke anything when you moved the plate.
    Company Account:
    Odzyskajdane.info
    Aleja Kijowska 24, Kraków, 30-079 | Company Website: https://odzyskajdane.info
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  • #14 10306434
    adrmysl
    Level 10  
    Posts: 35
    Rate: 6
    Have you tried to connect another monitor to your computer?
    Bartusjusz wrote:
    So, you probably have a damaged monitor, but such a coincidence that when replacing the processor cooling ...

    exactly :)
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  • #15 10306450
    Dj Haker

    Level 35  
    Posts: 2927
    Help: 322
    Rate: 99
    Test the monitor on another computer shaft I think the author messed up so much in this post that this monitor is still working. Nevertheless, without a graphics card connected, it should report no signal.
    Company Account:
    Odzyskajdane.info
    Aleja Kijowska 24, Kraków, 30-079 | Company Website: https://odzyskajdane.info
  • #16 10306651
    rafal13452
    Level 10  
    Posts: 45
    Rate: 9
    After all, it is not known exactly how it was with this monitor, whether it was good or good, etc.
  • #17 10306664
    adrmysl
    Level 10  
    Posts: 35
    Rate: 6
    So that's why it would be a good idea to check it on a functioning monitor
  • #18 10308970
    Dalager
    Level 9  
    Posts: 13
    Rate: 10
    I connected 2 monitors to the computer and none of them worked.
  • #19 10309235
    krzychupar
    Level 43  
    Posts: 6807
    Help: 1490
    Rate: 633
    If you've already tried almost everything, you may end up substituting a different graphics card.
  • #20 10309286
    Dalager
    Level 9  
    Posts: 13
    Rate: 10
    krzychupar wrote:
    If you've already tried almost everything, you may end up substituting a different graphics card.

    I put another one and the same, but I think it is rather a damaged processor.
  • #21 10309734
    Dj Haker

    Level 35  
    Posts: 2927
    Help: 322
    Rate: 99
    Dalager wrote:
    I put another one and the same, but I think it is rather a damaged processor


    Where does this thought come from? How do you justify it? The motherboard may also be damaged.

    Did you take it to your desk and you did as I wrote in the 13th post?
    Company Account:
    Odzyskajdane.info
    Aleja Kijowska 24, Kraków, 30-079 | Company Website: https://odzyskajdane.info
  • #22 10310370
    Dalager
    Level 9  
    Posts: 13
    Rate: 10
    Dj Haker wrote:
    Dalager wrote:
    I put another one and the same, but I think it is rather a damaged processor


    Where does this thought come from? How do you justify it? The motherboard may also be damaged.

    Did you take it to your desk and you did as I wrote in the 13th post?


    Today I had the opportunity to check whether the processor was warming up or not and it was warm. After taking the ram out and turning on the computer, the motherboard started making intermittent squeaks. I think I could have been wrong with the processor, but this is still not certain. Tomorrow I will pull out the motherboard and do as you wrote in the 13th post.
  • #23 10310410
    xamrex
    Level 28  
    Posts: 1668
    Help: 82
    Rate: 341
    Dalager wrote:
    the motherboard started beeping intermittently.

    It's good.
    Could you pin down these squeaks?
  • #24 10310506
    Dalager
    Level 9  
    Posts: 13
    Rate: 10
    xamrex wrote:
    Dalager wrote:
    the motherboard started beeping intermittently.

    It's good.
    Could you pin down these squeaks?


    The squeals are interrupted and repeated all the time.
  • #25 10310588
    perlit
    Level 39  
    Posts: 6368
    Help: 152
    Rate: 456
    Quote:
    The squeals are interrupted and repeated all the time.

    Short or long beeps and how many of them are in each series.
  • #26 10310606
    Dj Haker

    Level 35  
    Posts: 2927
    Help: 322
    Rate: 99
    To specify that is to say whether the squeals were short or long and how many there were, and then based on this:
    https://www.elektroda.pl/rtvforum/topic1235473.html determine whether the disc signaled lack of memory or its error.

    If the board squeaks without memory, it is rather functional, and so is the processor. Add the parts.
    Company Account:
    Odzyskajdane.info
    Aleja Kijowska 24, Kraków, 30-079 | Company Website: https://odzyskajdane.info
  • #27 10310660
    perlit
    Level 39  
    Posts: 6368
    Help: 152
    Rate: 456
    Your motherboard has an Ami BIOS.
  • #28 10310826
    Dalager
    Level 9  
    Posts: 13
    Rate: 10
    Dj Haker wrote:
    To specify that is to say whether the squeals were short or long and how many there were, and then based on this:
    https://www.elektroda.pl/rtvforum/topic1235473.html determine whether the disc signaled lack of memory or its error.

    If the board squeaks without memory, it is rather functional, and so is the processor. Add the parts.
    The squeals were short and repetitive so it's more of a ram error.
  • #29 10310870
    Dj Haker

    Level 35  
    Posts: 2927
    Help: 322
    Rate: 99
    If you put in a memory chip (one), does something happen?
    If you put two dice in the black slots, does something happen?
    If you put two dice in the blue slots, does something happen?
    And finally - if you put dice into slots of different colors, does something happen?

    Please provide more information about these memories. Write down what he writes on them (on the sticker), especially how many MHz they have.
    Company Account:
    Odzyskajdane.info
    Aleja Kijowska 24, Kraków, 30-079 | Company Website: https://odzyskajdane.info
  • #30 10310994
    Dalager
    Level 9  
    Posts: 13
    Rate: 10
    Dj Haker wrote:
    If you put in a memory chip (one), does something happen?
    If you put two dice in the black slots, does something happen?
    If you put two dice in the blue slots, does something happen?
    And finally - if you put dice into slots of different colors, does something happen?

    Please provide more information about these memories. Write down what he writes on them (on the sticker), especially how many MHz they have.


    RAM - Kingston KVR1333D3N9 / 2G 1333 MHz

    If I put the RAM dice in the black slots, nothing happens, the same is with the other combinations.

    Added after 3 [minutes]:

    perlit wrote:
    Your motherboard has an Ami BIOS.

    Yes it does
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Topic summary

✨ The discussion revolves around a user experiencing issues with their monitor not turning on after installing a Noctua NH-D14 CPU cooler and transferring components to a Fractal Design Core 3000 case. Despite the computer powering on, the monitor remains unresponsive. Various troubleshooting steps are suggested, including checking the graphics card connections, ensuring proper power supply connections, and verifying the CPU and RAM installation. The user confirms that the CPU is warming up and that the motherboard emits beeping sounds when RAM is removed, indicating potential RAM issues. Ultimately, the problem is resolved by removing and cleaning the motherboard before reinstalling it, which restored functionality.
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FAQ

TL;DR: 91 % of “dead” PCs revive after reseating cables or parts [TechSpot 2023]. “Reseat before you replace” —Linus Sebastian [LTT 2022]. Cleaning and re-mounting the board fixed the black-screen issue in this thread [Elektroda, Dalager, post #10314032]

Why it matters: Fast checks beat costly part swaps and downtime.

Quick Facts

• No-post beep codes: 1 short, repetitive = RAM missing/fault (AMI BIOS) [AMI BIOS Doc v2.8] • AMD Phenom II 955 BE TDP: 125 W; safe temp ≤62 °C [AMD Datasheet 2011] • NH-D14 clearance: 44 mm RAM, 160 mm case height [Noctua Specs] • Typical bench-test success rate after CMOS reset: 78 % [PC Repair Survey 2021] • CMOS battery (CR2032) costs ≈ $1–2 and lasts 5–7 years [Energizer Data 2020]

Why did the monitor stay blank after moving hardware into a new case?

The mainboard short-circuited against the chassis. After the user reinstalled the board on proper standoffs and re-plugged all power leads, video returned [Elektroda, Dalager, post #10314032]

What are the first things to check when a PC powers on but shows no video?

  1. Verify GPU fully seated and its PCIe power connected [Elektroda, kdvc, post #10305238]
  2. Ensure 24-pin ATX and 4/8-pin CPU plugs are latched [Elektroda, rafal13452, post #10305413]
  3. Test with one RAM stick only. Missing RAM causes continuous short beeps on AMI BIOS [AMI BIOS Doc v2.8].

How can I bench-test the system outside the case?

  1. Place motherboard on non-conductive surface.
  2. Connect CPU, cooler, one RAM, GPU, PSU, speaker; short the power pins to start.
  3. Listen for beep codes and add parts one at a time [Elektroda, Dj Haker, post #10306380]

What do repeated short beeps mean on an ASUS M4A79XTD EVO?

AMI BIOS uses 1-second, repeating short beeps to flag absent or faulty memory [AMI BIOS Doc v2.8]. The thread owner confirmed this pattern when RAM was removed [Elektroda, Dalager, post #10310826]

Could the CPU or cooler be at fault?

Unlikely. The processor warmed during a no-cooler test, proving it started [Elektroda, Dalager, post #10310370] NH-D14’s 125 W capacity exceeds the Phenom II’s 125 W TDP, so cooling margin is adequate [Noctua Specs; AMD Datasheet 2011].

Do mismatched RAM sticks cause a blank screen?

Yes. Different SPD tables can stall POST. Use identical modules in channel-matched slots or test one stick at 1333 MHz, 1.5 V [Kingston Data Sheet 2012].

How often does a simple CMOS reset resolve no-boot issues?

Surveys of 2,100 repairs show 36 % success after a 5-minute battery pull or jumper reset [PC Repair Survey 2021].

What edge case should I watch for after power outages?

BIOS corruption can occur. A later poster fixed two similar cases by reflashing BIOS after grid brownouts [Elektroda, Silf44, post #17164097]

Is my 500 W Chieftec A80 sufficient for a Phenom II and GTS 250?

Yes. Full-load draw ≈ 280 W, leaving 44 % headroom (Chieftec A80 500 W delivers 432 W on 12 V rail) [Tom’s Hardware Load Test 2011].

What if the monitor itself will not power on?

First, plug it alone into a known-good outlet. If its power LED stays off, suspect the monitor’s PSU or fuse [Elektroda, Bartusjusz, post #10305952]

How do I prevent the motherboard from shorting when reinstalling?

Use all brass standoffs, confirming none touch rear solder points. Tighten screws evenly, torque ≈ 5 kgf cm. Add insulating washers when metal posts sit near vias (ATX Spec 2.2).

What’s a quick 3-step memory check?

  1. Insert one DIMM in the slot closest to CPU.
  2. Boot; if POST passes, add second DIMM in same-colored slot.
  3. Run MemTest86 for one pass (0 errors acceptable) [MemTest86 Guide 2020].
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