A couple of days ago, my computer shut off abruptly in the middle of normal operations (I wasn't doing anything out of the ordinary on it) and wouldn't turn on when I pressed the power button. There was just no reaction at all.
Last night, I performed the paperclip test on the PSU. The result is this:
When I turn off the PSU, unplug the power cable, disconnect the PSU from everything, insert the paperclip, plug the power cable back in, and turn on the PSU, the PSU fan starts to spin.
If I then turn the PSU off and back on again, the fan does not
If I unplug the power cable, re-plug it, and then turn the PSU back on, the fan will start to spin.
Is that as expected? I was hoping that it was just a fried PSU, as that's trivial to replace, but it seems like maybe the PSU's fine? In which case I guess the next step is testing the motherboard, but to be frank I'm not 100% sure how to go about doing it. When the computer is wired up for normal operations (meaning, the PSU's plugged into everything, etc), the motherboard light that indicates whether or not there's stand-by power is a steady red (indicating that yes, there is stand-by power), and all the ostentatious motherboard lighting effects are on, but there's no reaction when I hit the power button: PSU fan doesn't spin, no activity from the harddrives, the CPU cooler fan doesn't spin, there's no POST beep from the speaker, etc.
Could anyone offer some advise on where to go from here?
For reference, my PSU is this
6-year-old veteran, and my motherboard is this one
. I built the computer last year (the PSU I cannibalized from my previous build), and haven't noticed any hardware issues until this sudden shut-down.