I have two computers: my main one, and an older one. Currently, both are fully hooked up, and neither will respond when the power button is pressed or held. No fans, no lights, no sign at all.
Prior to tonight, both had been running just fine, daily, and there have been no hardware changes for 8 months.
From the beginning: I was gaming away on my main computer, when it shut off. It sounded like it does when the power goes out in the house, but that wasn't the case this time, and it wouldn't turn back on.
Naturally, I tried to diagnose the problem by swapping parts, one by one. I first tried hooking up the old computer's power supply (550 W) to the new computer. There was no difference. So I figured it must not be the power supply. Just to be sure that it wasn't, I tried hooking up the new power supply (700 W) into the old computer. It didn't turn on either.
It was at this point that I returned both computers to their original configurations. Checked all of the connections: 24-pin motherboard, 8-pin motherboard, case power switch, everything.
And now the old one won't turn on either, even though it's back to exactly the way it was.
The only difference between how the two are working right now is that the old power supply (550 W), very rarely shows signs of life - a brief light on the new case, or a brief twitch of the CPU fan on the old computer.
I inspected carefully for any signs of physical damage on both motherboards, but other than capacitors bubbling, I don't really know what to look for.
So, did my motherboard fry both power supplies? Did my power supply fry both motherboards? I have no idea what's going on here. I realize that I was reckless in my part swapping and fried one more thing than I should have, whatever it is. I'm fully prepared to buy three new components tomorrow if I have to.
I would just like to know how I can verify, without ruining anything else, exactly which parts I need to swap out for new ones. I searched other questions but I don't see any with quite the same symptoms. Particularly, I think the old power supply may still be working but both motherboards are junk.
Relevant parts list:
New: Gigabyte GA-Z77X-D3H motherboard OCZ Mod X Stream Pro 700 W power supply Old: Intel DP55WB motherboard Ultra ULT-H550W power supply
EDIT - UPDATE Bought a power supply tester, and used it to verify the problem. The new computer's power supply was completely dead, the old computer's power supply was fine. Bought a new power supply for the new one and it works. The old computer still won't turn on, but at least I'm up and running and can troubleshoot that one at my own leisure.