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Problem with the motherboard power supply - 4pin to 8pin power supply.

Plmkohehe 6936 12
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  • #1 16770400
    Plmkohehe
    Level 7  
    Posts: 5
    Hello, I have a problem with the computer, I will start with its components:
    Motherboard: Asus H87M-E
    Processor: Intel Pentium G3258
    Power supply: White Energy 400W
    Ram: any one 4GB chip

    The problem itself is that when I connect a power supply that is functional to the motherboard, there is no reaction. The fans are not spinning, there is only a green LED on the motherboard. The board has an 8pin atx input, and I connected 4pin, could this be a problem or something else? I will only add that when I connected the power supply to the older 4pin board it worked.
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  • #2 16770409
    badboy84
    Level 43  
    Posts: 8749
    Help: 1197
    Rate: 1483
    Quote:
    DO NOT forget to connect the 4-pin / 8-pin ATX + 12V power plug. Otherwise, the system will not boot up.


    This is what the manual says, so theoretically the board should work with a 4pin plug connected. Unfortunately, the power supply you have is not the highest quality, so I would suggest checking the motherboard with a branded power supply. Or at least check the voltage of your power supply with a tester.
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  • #3 16770411
    kokapetyl
    Level 43  
    Posts: 13444
    Help: 1787
    Rate: 2089
    Plmkohehe wrote:
    the board has an 8pin atx input and I plugged 4pin or this may be a problem

    That's probably not the problem.
    Plmkohehe wrote:
    400w white energy power supply

    Read about the "black list of power supplies"
    Measure the voltages of the power supply upsc-d s30122-k5660-m300-e1
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  • #4 16770454
    Plmkohehe
    Level 7  
    Posts: 5
    So there is no need to play with 4pin to 8 adapters, just buy a good power supply.
  • #5 16770470
    badboy84
    Level 43  
    Posts: 8749
    Help: 1197
    Rate: 1483
    Yes, buying a new power supply is a smart decision.
    Create a topic in the What to buy section, enter the amount, then something will be advised.
    By the way, only if you intend to use an integrated graphics card or buy a card, it should also be mentioned.
  • #6 16770474
    kokapetyl
    Level 43  
    Posts: 13444
    Help: 1787
    Rate: 2089
    Plmkohehe wrote:
    So there is nothing to play with 4pin to 8 adapters, but buy a good power supply

    At least, check the one you have (measurements). The problem could also be outside of the power supply, although he is the prime suspect.
  • #7 16771785
    Plmkohehe
    Level 7  
    Posts: 5
    Siena today I checked this pltte by connecting to another friend's power supply (also 4pin) And it looked the same or is it a board to be replaced?
  • #8 16771824
    Anonymous
    Anonymous  
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  • #9 16771836
    Plmkohehe
    Level 7  
    Posts: 5
    And will there be a 4pin to 8 adapter or it must be a power supply?
  • #10 16771859
    Anonymous
    Anonymous  
  • #11 16771997
    Plmkohehe
    Level 7  
    Posts: 5
    I bought this adapter because the store is close and now everything works normally, i.e. the fans are working, etc., but there is a new problem. When turned on, the computer starts up but nothing is displayed on the screen. I tried with the graphics card and connected to the motherboard and the same thing all the time.
  • #12 16772039
    Robert B
    Level 43  
    Posts: 22594
    Help: 2027
    Rate: 1412
    Plmkohehe wrote:
    everything works fine

    Plmkohehe wrote:
    but nothing is displayed on the screen

    :lol:
    The album does not start and that's it. Change this scrap for a power supply.
  • #13 16772099
    dt1
    Admin of Computers group  
    Posts: 47961
    Help: 7262
    Rate: 8187
    Since it was tested on two power supplies (and we will assume that the author found a functional power supply for the test), then buying a third one is a solution for the future - it will be useful after replacing the board, because everything indicates that it is damaged. Unless the author connected a quality power supply similar to the first one ...

    This CD has a colleague from the news, did he get it as "should work"? It is worth trying to do a BIOS reset (jumper on the board). Memory installed correctly, functional? You can try to move the memory to the adjacent slot. Is there a buzzer connected to the hob? If not, then it's worth plugging it in. Does the buzzer beep when I remove the RAM and start the computer (without any memory)?
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Topic summary

✨ The discussion revolves around a power supply issue with an Asus H87M-E motherboard, where the user reports no response when connecting a 4-pin power supply to an 8-pin ATX input. Responses suggest that while a 4-pin connection may theoretically work, the quality of the power supply (White Energy 400W) is suspect. Users recommend testing the power supply's voltage and considering a branded power supply for reliability. An adapter from 4-pin to 8-pin is mentioned as a potential solution, but it may not provide sufficient power. The user later reports that after using an adapter, the system powers on but displays no output, prompting further troubleshooting suggestions, including checking RAM installation and performing a BIOS reset.
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FAQ

TL;DR: Two PSUs were tested; "DO NOT forget to connect the 4‑pin / 8‑pin ATX +12V power plug. Otherwise, the system will not boot up." Use a quality PSU with proper 8‑pin CPU power rather than a 4‑to‑8 adapter. [Elektroda, badboy84, post #16770409]

Why it matters: This FAQ helps PC builders fix no‑boot issues when using 4‑pin CPU power on 8‑pin motherboards.

Quick Facts

Will a 4‑pin CPU power plug work in an 8‑pin socket on the Asus H87M‑E?

The manual quote says 4‑pin or 8‑pin can be used, but success depends on PSU quality and load. Weak PSUs may light LEDs while failing to start the board. "DO NOT forget to connect the 4‑pin / 8‑pin ATX +12V power plug." [Elektroda, badboy84, post #16770409]

Do I need a 4‑to‑8 pin adapter or a new PSU?

Prefer a reputable PSU with a native 8‑pin CPU connector. Adapters can power fans yet fail POST, causing no display. Forum guidance favored buying a good PSU over using an adapter for reliability and future upgrades. [Elektroda, badboy84, post #16770470]

Why do my fans spin but I get no display after using a 4‑to‑8 adapter?

Spinning fans only show that some rails power up. The CPU VRM may still be under‑supplied, so the system never POSTs. This exact symptom occurred after adding a 4‑to‑8 adapter: fans ran, but nothing appeared on screen. [Elektroda, Plmkohehe, post #16771997]

I tested two different 4‑pin PSUs and it still won’t boot—what next?

Two PSUs with 4‑pin CPU power yielded the same result in the thread. Move to a PSU with a native 8‑pin CPU plug. If it still fails, proceed with CMOS reset, RAM reseat, and buzzer diagnostics. [Elektroda, Plmkohehe, post #16771785]

How do I clear CMOS and attempt first‑boot recovery on H87M‑E?

  1. Power off, unplug PSU, then short the CLR_CMOS jumper per board silkscreen for a few seconds.
  2. Install one known‑good RAM stick in the primary slot; reseat if needed.
  3. Connect a buzzer and attempt boot; listen for RAM‑related beep codes with RAM removed. "It is worth trying to do a BIOS reset (jumper on the board)." [Elektroda, dt1, post #16772099]

Is my motherboard dead if it shows a green LED but won’t start?

Not necessarily. A poor‑quality PSU can light standby LEDs while failing under load. Verify PSU voltages with a tester or multimeter, then try a quality unit. Only suspect the board after these checks and a CMOS reset. [Elektroda, kokapetyl, post #16770411]

What is the EPS12V 8‑pin CPU power connector?

It’s the dedicated 12V power feed for the CPU VRM. Some boards accept 4‑pin, others need all 8 pins to start reliably. One user’s board did not start until an 8‑pin‑equipped PSU was used. [Elektroda, 3029369, post #16771824]

Can integrated graphics vs. a discrete GPU change this outcome?

Mention intended graphics when selecting a PSU. A discrete GPU raises total load and increases the need for a stronger, reputable PSU. Forum advice recommended stating whether you’ll use iGPU or add a GPU before buying. [Elektroda, badboy84, post #16770470]

Is a 4‑to‑8 adapter safe to use long‑term?

It may work, but it won’t deliver the full current that an 8‑pin rail can supply. The thread warns this solution does not provide the right amount of power, risking instability under load. [Elektroda, 3029369, post #16771859]

My fans run but there’s no video—what quick checks should I do?

Reset CMOS, boot with one RAM stick, and try both iGPU and GPU outputs. Connect a buzzer; remove RAM and check for beep codes. If silent, focus on PSU and CPU power cabling. This sequence isolated similar no‑display symptoms. [Elektroda, dt1, post #16772099]

Should I measure PSU voltages before replacing parts?

Yes. Measure 12V, 5V, and 3.3V with a tester or multimeter before buying anything. The forum urged voltage checks and referenced the PSU “black list,” highlighting quality concerns. "Measure the voltages of the power supply." [Elektroda, kokapetyl, post #16770411]

Could the motherboard require all 8 pins even with a low‑TDP CPU like Pentium G3258?

It can. One user’s MSI board with 8‑pin CPU power showed no life on 4‑pin, yet started with a PSU that had 8‑pin. Board design, not CPU TDP alone, dictates the requirement. [Elektroda, 3029369, post #16771824]

What’s the role of the motherboard buzzer/beeper in diagnosis?

The buzzer emits beep codes that indicate missing RAM or other faults. If it beeps with RAM removed, the CPU and some logic run, so power delivery may be okay. Lack of beeps narrows the fault. [Elektroda, dt1, post #16772099]

Could a bad PSU make the system look totally dead even though LEDs are on?

Yes. A weak unit can bring up the standby LED but fail to start fans or CPU VRM under load. The thread flags the low‑tier PSU and advises quality testing or replacement. [Elektroda, kokapetyl, post #16770411]

What should I include when asking for a PSU recommendation?

State budget, planned GPU or iGPU use, and desired reliability. The thread suggests opening a “What to buy” topic with your amount and graphics plan for targeted advice. [Elektroda, badboy84, post #16770470]

Edge case: Everything powers, but still no POST after new PSU—now what?

Reset BIOS, reseat CPU and RAM, test one DIMM, and use the buzzer for codes. If it still fails, the board may be damaged, as one helper concluded after multi‑PSU tests. [Elektroda, dt1, post #16772099]
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