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

Dalager 122999 34
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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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  • #31 10311187
    perlit
    Level 39  
    Posts: 6368
    Help: 152
    Rate: 456
    You wrote in the first post:
    Quote:
    Ram - Kingston 2x 4 gb

    However, in the last one you say that you have 2GB of memory
    Quote:
    RAM - Kingston KVR1333D3N9 / 2G 1333 MHz
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  • #32 10311262
    Dj Haker

    Level 35  
    Posts: 2927
    Help: 322
    Rate: 99
    Because these are probably Dual bones, two identical. Suffice it to pass one. Test the memory on a different computer.
    Company Account:
    Odzyskajdane.info
    Aleja Kijowska 24, Kraków, 30-079 | Company Website: https://odzyskajdane.info
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  • #33 10311297
    Dalager
    Level 9  
    Posts: 13
    Rate: 10
    perlit wrote:
    You wrote in the first post:
    Quote:
    Ram - Kingston 2x 4 gb

    However, in the last one you say that you have 2GB of memory
    Quote:
    RAM - Kingston KVR1333D3N9 / 2G 1333 MHz

    I am sorry in the 1st post, I wrote incorrectly, I meant that I have 2x Kingston KVR1333D3N9 / 2G 1333 MHz and together it comes out 4 GB again, sorry my mistake; /

    Added after 4 [minutes]:

    Dj Haker wrote:
    Because these are probably Dual bones, two identical. Suffice it to pass one. Test the memory on a different computer.

    This is the problem because I don't have a second desktop computer, but a laptop.
    But I don't think it's RAM's fault. I can add that 1 RAM was bought at the beginning of this year and the second probably 3-4 months ago.
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  • #34 10314032
    Dalager
    Level 9  
    Posts: 13
    Rate: 10
    Problem solved I made it so I put the motherboard out and cleaned it and screwed it on again and it worked. Thanks to everyone for your willingness :)
  • #35 17164097
    Silf44
    Level 1  
    Posts: 1
    Rate: 1
    Hello.
    I had two such cases recently, and the BIOS crashed in both cases.
    After re-uploading it, everything flashes nice.
    I would like to add that the cause of the failure in both cases were computer resets due to power outages in the power grid.
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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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