You better answers provide full details of your PC as best as possible.
Repeat you past remedy, unplug AC cord for 10min. and then retry. If that doesn't work then that suggests your PSU is bad, replace with similar or more wattage unit. You should inspect the insides very closely for any "bad caps" issue, google for examples and it needn't be a real bad failure. More than likely its a bad PSU, excluding any other fault. Since, you've experienced this before usually means it was going until a total failure.
tada -----Willy ![]()
this morning i tried turning my desktop PC on and it wouldn't boot. No power light on, and on closer inspection the fan turns feebly for half a second or so, then it all stops.
I have tried unplugging the power cable and plugging it in again, which has worked before with this issue, but no luck this time. any suggestions of what this could be? How do I fix it?

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