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PC turned off while running and will not respond to anything.

Discussion in 'Specific Hardware Issues' started by McSpin, Apr 7, 2018.

  1. McSpin

    McSpin Registered Members

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    This is an 8 year old PC I built. I was not at the computer when it died. I was using it through a remote connection. The connection stopped, so I went to the location of the computer and found that it would not turn on. The electric had not gone off, since there was a clock plugged into the same outlet that did not need to be reset. There were no storms or any other indication of an electrical surge. The building it was in, was empty with nothing electrical running except things like clocks.

    When I hit the power button - zero response. I took it home with me to examine and after checking all the basics - power cord, cable connections, properly seated peripherals, there still was no response. No lights, no fans turning on - nothing. I changed out the CMOS battery for a new one - didn't help. I decided it was a good chance of a bad power supply and I had a new one for backup. I put that in, and no response. Now, I'm getting worried and suspect maybe the motherboard. I figured the on/off switch shouldn't be the problem since it died while being used. However, even with a MB problem, I would have expected something less dramatic than total death. I don't want to experiment with replacing that, if it might be something else.

    I took the graphics card out, checked RAM seating. I even disconnected all the drives just to see if I could get it to turn on. The only response I can get, is when I unplug the computer and then hit the on/off switch multiple times to drain any power from the system. When I plug it back in and hit the on/off switch, I get very momentary flash of the green light next to the on/off switch. It's just an instant flash and easy to miss if you aren't looking for it. To get the flash to happen again, I have to go through the same procedure of unplugging and multiple presses of the on/off switch, before retrying.

    I've been able to diagnose and repair a lot of computer problems over the years, but this one has me stymied. Any ideas?
     
  2. Seth Anthony

    Seth Anthony Registered Members

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    Hi McSpin.

    This is a long shot, but try one ram stick at a time.

    If that doesn't work, it's the mobo.
     
    allheart55 (Cindy E) likes this.
  3. McSpin

    McSpin Registered Members

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    Would bad ram cause it to instantly turn the power off?
     
  4. Seth Anthony

    Seth Anthony Registered Members

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    In theory, a ram stick could develop a fault in which it is shorting out and causing a no power up issue.

    Again, it's a long shot, but it's also the only shot you have left.
     
  5. McSpin

    McSpin Registered Members

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    I may have found the problem. In the past I had disconnected all drives. This time I disconnected everything except the boot drive, including DVD drives, usb drives and I got it to boot to a screen saying "boot disk failure, insert system disk". The fact that the PC turned on was good, but it shouldn't have this screen with my boot drive connected. I reconnected my other hard drives and then I was back to the PC not turning on. It seems like one of the other drives might be the problem, but if so, why can't the boot drive get past this screen?

    My boot drive is a newer SSD. When I take it out, I can read the files on another computer. If the drive was bad, could I do that?
     
  6. Tony D

    Tony D Super-Moderator Super Moderators

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    A bad drive may take down the buss.
     
  7. Seth Anthony

    Seth Anthony Registered Members

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    Check that the SSD is being recognized in the BIOS. If it is, make sure it's set to boot first, or if have you a boot menu hot key, use that and see if it boots to the SSD.

    Also, corrupt boot files on the SSD may cause that error (probably by the hard shutdown).
     
  8. McSpin

    McSpin Registered Members

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    After examining the SSD closely, I found what is likely the problem. On of the contacts on the SSD is burnt. It appears to be shorting out. It looks like a manufacturing defect. One of the pins is deformed. Looks like a new SSD will be the answer.
     
  9. Seth Anthony

    Seth Anthony Registered Members

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    What's concerning is you can read the files on the other computer, and the PC still doesn't turn on with the other drives connected.
     
  10. McSpin

    McSpin Registered Members

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    I think that is because the power supply connector is fried, and I didn't want to fry another, so I haven't tried connecting it to any new connectors. I don't want to keep shorting this out, so I'm going to RMA the drive and put in a new one. The drive is backed up and has a clone of it on another drive. So, even if there is something else wrong, I need the new drive anyway.
     
  11. Seth Anthony

    Seth Anthony Registered Members

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    Mouse on a wheel
    So does it post with one of the other drives connected (on a different sata cable and power channel)?

    Does it post with all drives disconnected?
     
  12. McSpin

    McSpin Registered Members

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    The clone of the boot is on an external drive, that I have not tried to connect. I haven't tried a new power cable, since I don't have an extra. I'd have to get one off another computer.
     
  13. Seth Anthony

    Seth Anthony Registered Members

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    It should post without the drives connected. Does it?
     
  14. McSpin

    McSpin Registered Members

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    Yes, once I removed the power cable. Even with the drives disconnected, it would short with the cable still plugged into the power supply. I can get into the bios and everything looks normal.
     
  15. Seth Anthony

    Seth Anthony Registered Members

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    Ok, that's a good sign.
     
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  16. McSpin

    McSpin Registered Members

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    Yes, it's looking positive right now. I think once I get the new SSD and a new cable, I should be back in business. Thanks for the help.
     
  17. Seth Anthony

    Seth Anthony Registered Members

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    So is it the sata cable or power cable that's damaged?
     
  18. McSpin

    McSpin Registered Members

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    It was the power cable. It was definitely shorting out on one of the pins on the drive. It actually melted some of the plastic and the metal contacts were deformed (probably touching each other)
     
  19. Seth Anthony

    Seth Anthony Registered Members

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    pen and paper
    Graphics Card:
    TV ready
    Power Supply:
    Mouse on a wheel
    Wow.

    I'm surprised it didn't fry the ssd's pcb and you can still read the files.
     
  20. Seth Anthony

    Seth Anthony Registered Members

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    pen and paper
    Graphics Card:
    TV ready
    Power Supply:
    Mouse on a wheel
    With your knowledge and my skimming over your original post with all the disconnections, I mistakenly thought you already disconnected the drives to see if the system would post.

    I won't make that mistake again.
     

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