Cousin's PC will not turn on, trying to diagnose the cause.
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Thread: Cousin's PC will not turn on, trying to diagnose the cause.

  1. #1
    Join Date
    Oct 2003

    Unhappy Cousin's PC will not turn on, trying to diagnose the cause.

    Yeah, these are always fun since it could be just about any vital component and sometimes even non-vital ones that cause it.

    From what I recall, his specs are:
    OS: Windows 7
    CPU: i7-4770K
    PSU: Seasonic SS-760XP2 760W
    Motherboard: Asus Z97-PRO(Wi-Fi ac)
    GPU: GTX 770, don't recall the make.
    I don't remember the rest of the specs, but I don't think they are relevant to this.

    My cousin told me that his PC suddenly stopped working and would not turn on, he sent me this video:

    I went over to check, pressing the power button just made the PC attempt to power on for half a second, then shut off, and it would loop like this until you did a forced shutdown.

    The motherboard has a POST code display, but it would just show 00 on it, which leads me to believe that it's not even trying or getting able to POST before it shuts down. I really hope this means that the issue is likely something else and not the motherboard, especially since IIRC this model of motherboard can function in an emergency BIOS re-flash mode with nothing but a PSU and USB drive connected to it, not even a CPU.

    Normally I suspect the PSU in these cases since that has almost always been the case in my personal experience. I removed the GPU just to be safe and connected the HDMI port to the motherboard's internal video, there was no video signal detected. I tried making sure all the connections were not loose, use different cables or ports on the modular PSU for the necessary power connections, etc, nothing. Even stranger the motherboard/PSU seemed to be keeping power (there is an internal backlit power button on the motherboard for testing purposes that acts as the case power button, even with the PSU's physical switch set to off and the power cable unplugged from the wall this button was still lighting up, unplugging the ATX20 cable was the only thing that turned it off) even with the physical PSU switch off at times. Nothing was making a difference until I attempted to run it with the additional (I think it's called CPU power?) 8-port connector removed. I wasn't expecting it to turn on at all or just keep looping since that is a mandatory power connector, but instead it stayed on this time and the video even flickered. It still would not POST since from what I understand that is a mandatory connection in boards these days, but there was some different behavior at least.

    According to the PSU's manual all of the ports in that connector are just simply 12V, so I got a multimeter and tried testing them, but was surprised to find that they were all delivering 12V. I tried to use the multimeter on the ATX20 connector to see if anything there was delivering the incorrect or no voltage but could not get the probes to come in contact while it was plugged in. I tried unplugging the ATX20 connection and jumping the power-on pins..... but he didn't have anything on hand that I could use to jump it, the only insulated wire he had was speaker wire that was far too thick to go in the connectors. So we ordered a PSU tester, it's set to arrive on Tomorrow.

    And there is where I am right now. I am not sure what else to do if the PSU tester shows up as the PSU being fine, so I wanted to ask for advice, both on what could be the case and what else I can try if the PSU turns out to be fine. The next part I would suspect is the motherboard, but I am not aware of any real way to test that short of buying another motherboard and completely disassembling and reassembling the PC, plus if we can't get the same motherboard that likely means a Windows reinstall as well.

    Any advice or tips about this?
    "A train station is where a train stops. A bus station is where a bus stops. On my desk I have a workstation..." - William Faulkner

  2. #2
    Join Date
    Feb 2000
    Idaho Falls, Idaho, USA
    If you have a known good PSU, try that with all non-essential items disconnected - video and add-in cards, drives, etc. - just the MB, CPU, memory. If nothing, then likely it is a motherboard issue. Check the motherboard carefully for any signs of damage or burn marks. Check for a loose CPU heatsink/fan, or failed heatsink compound.

  3. #3
    Join Date
    Jul 2019
    Good One @jdc2000
    I suggest If nothing will have happened after all these steps suggested by friend jdc2000. You have to check to the service center if you don't know much about computer hardware. Because there is no such video who will help you to find that error.

  4. #4
    Join Date
    Jul 2019
    Thanks alot

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