Do I have a bad power supply?

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  1. Posts : 58
    10
       #1

    Do I have a bad power supply?


    Hello All,

    My computer has started to randomly shut down and then once its shut down, it will try to randomly start up. It will power up and try to cycle and then power down. If I do not remove the power chord, the PC will keep trying to start up.

    I have not made any changes to the power setting recently. I have disabled Windows Fast Start Up as that was causing issues. I have turned off the option for "sleep" when I have seen the option. It is still on in the additional power settings\change what the buttons do but other than that, sleep is disabled.

    Windows Update is on so perhaps Windows released a "fix" recently...?

    I could check more settings but I have a feeling my Power Supply is bad. I plugged the power chord back in and the PC tried to start up but failed. I turned it off before it could cycle a bunch of times and try to start up.

    What does everyone else think?

    Thanks, Bill
      My Computer


  2. Posts : 3,995
    Windows 7 HP 64 - Windows 10 Pro - Lubuntu
       #2

    bpatters69 said:
    My computer has started to randomly shut down and then once its shut down, it will try to randomly start up. It will power up and try to cycle and then power down. I plugged the power chord back in and the PC tried to start up but failed. I turned it off before it could cycle a bunch of times and try to start up.

    Thanks, Bill
    When it starts it has two phases:
    - POST (BIOS startup)
    - Windows start.

    When you mention it is starting and fails, is it on POST or Windows start?
      My Computers


  3. Posts : 34,985
    Win 10 Pro (1903) (2nd PC is 21H2)
       #3

    Hi, there are so many possibilities here - the PSU is just one.

    a. try booting from a live boot disk to eliminate the internal disk and see if the PC is stable. A Win 10 live boot disk is usually of an odler build than you have installed.
    b. If you choose a live boot disk with e.g. Crystal Diskinfo on it such as Gandalf's, you can check the SMART parameters of your disks.

    Indeed you can do that with e.g. the portable version of Crystal Diskinfo.

    Checking your RAM requires your PC to stay on long enough, as do stress tests. If you can find a way to boot your PC so it stays up for long enough, you can run such tests.

    Otherwise you wil need to find a way to substitute for parts - a process of elimination.

    Please confirm you made no hardware changes prior to this starting to happen.
      My Computers


  4. Posts : 34,985
    Win 10 Pro (1903) (2nd PC is 21H2)
       #4

    Hi, there are so many possibilities here - the PSU is just one.

    a. try booting from a live boot disk to eliminate the internal disk and see if the PC is stable. A Win 10 live boot disk is usually of an odler build than you have installed.
    b. If you choose a live boot disk with e.g. Crystal Diskinfo on it such as Gandalf's, you can check the SMART parameters of your disks.

    Indeed you can do that with e.g. the portable version of Crystal Diskinfo.

    Checking your RAM requires your PC to stay on long enough, as do stress tests. If you can find a way to boot your PC so it stays up for long enough, you can run such tests.

    Otherwise you wil need to find a way to substitute for parts - a process of elimination.

    Please confirm you made no hardware changes prior to this starting to happen.

    You can check for overheating and voltages - e.g. using HWINFO64
    Do I have a bad power supply?-1.png

    Please confirm you are not overclocking.
      My Computers


  5. Posts : 366
    Windows 10 Pro x64
       #5

    One thing I would suggest is to unplug the power cord from the machine and press and hold the power button for about 10 seconds, then leave it unplugged for an additional 5-10 minutes. This will allow all risidual charge to bleed from the system. After this, try and start it up again.

    Ive had to do this with a system I had before. It would help and it would start up fine the next time. Then, not long after, the mobo failed. Not saying this will happen to you, but its a consideration.

    I would also check to see that nothing inside the computer is loose. Check the RAM, all the cords inside, video hardware, etc.
      My Computers


  6. Posts : 58
    10
    Thread Starter
       #6

    Thanks for the replies. They are all very helpful.

    Here is what I have tried:

    • I re-seated the graphic card and RAM. I placed the graphic card in a different slot than what it was in before.
    • I took out a Sound Blaster Sound Card that I had recently installed to eliminate it from the equation.
    • I replaced the SATA cable between the Mobo and my primary hard drive
    • I looked for any loose or mis-aligned cable but I did not see anything
    • I removed the power chord and pressed and held the power for about 30 seconds


    I tried a restart a couple of times and it tried to restart and I saw A2 and A6 flash on the digital display on the Motherboard. The computer would stay running but there was no post as far as i could tell. It was like the PC tried, got to a certain point and then just sat there. It was running so it had power. I tried connecting the monitor directly to the onboard graphics but I still could not see any post or messages of any kind.

    Now when I hit the power, there is nothing. DOA. No attempt to start, no power, just silence. Sigh. This has to be a bad power supply, doesn't it? The half attempts I saw previously were simply the dying attempts of the PSU to start the PC... right?

    The only change which I made at least a month ago was the addition of the SB Sound Card.

    I checked for overheating earlier this am when I was able to get the computer to start. I think the Mobo and CPU were 31 degrees Celsius which is ideal according to google.
      My Computer


  7. Posts : 3,995
    Windows 7 HP 64 - Windows 10 Pro - Lubuntu
       #7

    It can be the Power supply, MB or CPU.
    I had a Z87 MB that began to restart randomly, went getting worst then it did no start. I replaced the MB and never happen again.
    In my wife's computer I've replaced the PS twice.
    If you have a spare PS give it a try.
      My Computers


  8. Posts : 58
    10
    Thread Starter
       #8

    Thanks All. I have a feeling it is the PSU. The PC was running fine until the last day or two. The first symptom was it restarting after I had shut it down. I thought it was Widows Fast Start acting up but I confirmed it was still disabled. Today the problem got progressively worse and now, as I said, its pretty much DOA.

    - - - Updated - - -

    To close out this thread, it was the power supply. The odd thing is the power supply tested fine. All power was within specifications.
      My Computer


  9. Posts : 3,995
    Windows 7 HP 64 - Windows 10 Pro - Lubuntu
       #9

    Glad you've fixed it.
      My Computers


  10. Posts : 366
    Windows 10 Pro x64
       #10

    Glad to hear you got it figured out. PSU can be a tricky thing sometimes. Years ago, I had a bad PSU trash two mobos. I thought the first time it was just the MB that went out, but then I replaced it and the replacment did the same thing before too long. Thankfully, the replacement MB was a pull and didnt cost much.
      My Computers


 

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