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Have i killed my PC?

This is a discussion on Have i killed my PC? within the RAM and Power Supply Support forums, part of the Tech Support Forum category. I fitted a new semi modular psu today (gigabyte B700h) and when i switched on nothing happened. So assuming i


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Old 10-10-2019, 11:30 AM   #1
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I fitted a new semi modular psu today (gigabyte B700h) and when i switched on nothing happened. So assuming i had a duff unit i refitted the old psu (XFX Pro550w) but again nothing happened.

I've been testing both old and new psu with the paper clip method. I get no fan with the old psu but testing a molex with a volt meter shows 12v power. And with the new psu the fan spins for a couple of seconds and stops, but i tested one bank of the mobo connector pins and they all came up with the correct voltages. So it looks like both psus are fine.

Can anyone please give me some idea what might have gone wrong? I'm really knackered without my PC and would be extremely grateful for any help.
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Old 10-10-2019, 11:52 AM   #2
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Old 10-10-2019, 12:40 PM   #3
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Thanks for the response. It encouraged me to take another look and the front panel was fouling the switch. I've fixed that and partially hooked up the new psu again and it seems to be running fine :-)
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Old 10-11-2019, 06:36 AM   #4
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It encouraged me to take another look and the front panel was fouling the switch.
I don't understand how the front panel was even involved in swapping out PSUs but I am glad you discovered and were able to resolved the issue. And thanks for coming back and letting us know what you did.

BTW, for future reference, the "paper clip method" is not a conclusive test for PSUs. All that does is tell you if the PSU is able to turn on. It does not tell you if all the voltages are present, correct or "clean" (no excessive ripple).

And measuring with a multimeter is not conclusive either because to get a proper reading, the PSU must be tested under a variety of realistic loads.

So conclusively testing a PSU requires it be tested under a variety of realistic loads and then the voltages read by an oscilloscope, or it must be tested with a dedicated power supply analyzer. These are sophisticated and expensive pieces of test equipment that require training to use and some significant understanding of electronics to interpret the results.

So the next best thing for amateurs and professionals alike is to swap in a known good PSU - which you did.
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Old 10-11-2019, 08:07 AM   #5
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Thanks for the info. I was giving the case and components a much-needed clean while i was at it, and the front needs to come off to clean the fan grill. It was as much this extra work that i feared had caused a big problem, or clumsiness hooking up the various cables. But all is still well, thanks :-)
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