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New working system build not starting after USB device connected to system (but system had no power connection)

Hello - I have searched the forums prior to this, but if there is already an answer to this, please feel free to point me in that direction. I appreciate any and all help in advance. Thank you.

My basic question is:
What can a USB connected device do to a machine that is not plugged in itself (e.g. PSU is not plugged into wall), but itself sparks when connecting to it's own local power?

My more complicated question is:
What could have gone wrong here and what can I salvage to get this system up and running?

Situation:


Things I have (and have not) checked:


The system:
9 answers Last reply Best Answer
More about working system build starting usb device connected system system power connection
  1. I bet the PSU died. That is the first thing I would check out. If you have a volt meter, see what the voltages are.
  2. spooky2th said:
    I bet the PSU died. That is the first thing I would check out. If you have a volt meter, see what the voltages are.


    Thanks - I am thinking that is what it is... but I thought I would throw it out there to see if I missed anything. I hope I can RMA it as the unit is only like 1 day old and I don't think that I was using it abnormally.

    out of curiosity - how often do PSUs fail? Is it rare or common?
  3. You can look at the reviews of just about any PSU and there are always some dead on delivery and some die real soon within days or a month or two.
  4. Best answer
    You got a cheapo PSU.

    That's why it crapped out on you.

    A PSU can kill your entire computer, so you need to treat the PSU with the same respect you would a CPU or GPU, spend money and buy a quality one.

    PSUs can hold power even when unplugged from the wall, to disperse any built up power, press the power button on the case after unplugging the PSU, your fans will spin for about a second and then there won't be any power in your computer and it will be safe to go touching the stuff inside it.
  5. James Mason said:
    You got a cheapo PSU.

    That's why it crapped out on you.

    A PSU can kill your entire computer, so you need to treat the PSU with the same respect you would a CPU or GPU, spend money and buy a quality one.

    PSUs can hold power even when unplugged from the wall, to disperse any built up power, press the power button on the case after unplugging the PSU, your fans will spin for about a second and then there won't be any power in your computer and it will be safe to go touching the stuff inside it.


    Thanks - I had a suspicion that my "value buy" may have been part of the reason for the failure. Are there any ITX PSU brands that you would recommend? I appreciate any pointers. I have built several boxes from the graveyard of perviously working machines, but this is the first one wherein I have the option to chose all the components.
  6. Choose a PSU from Seasonic or XFX that meets your wattage requirements. It appears the case actually accepts regular fullsize atx PSUs.
  7. James Mason said:
    Choose a PSU from Seasonic or XFX that meets your wattage requirements. It appears the case actually accepts regular fullsize atx PSUs.



    Thanks for the suggestion.
  8. James Mason said:
    Choose a PSU from Seasonic or XFX that meets your wattage requirements. It appears the case actually accepts regular fullsize atx PSUs.



    Thanks again. After replacing the PSU and rebooting the system the following is happening:


    Because 5 beeps is a "VGA error" for the ASROCK UEFI BIOS, I know that it is a graphics problem based on the beeps, and I have reseated the CPU (and checked for bent pins), as well as reseated all RAM, etc.

    My Question is if the 5 beep code refers to a video error and I am using an AMD chip with (see above) with integrated Radeon graphics, should I RMA the motherboard or the CPU?

    My guess is based on the original problem, it's the motherboard, but I wanted to check with more seasoned minds than mine.
  9. Looks like the PSU was not the only thing damaged. The only way I can think of, is to install another CPU and see what happens.
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