Did my PSU or motherboard die?

Blarzor

Distinguished
Nov 1, 2011
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Hello,
yesterday I normally turned off my PC at 1 PM. After I returned home at 9 PM, I tried to power on my PC but to no avail. I first thought that it was a common problem that I had and it would resolve by itself (every time I would disconnect and connect electricity again to my computer, I would have to wait about 3 minutes for PC to finally power on - In this case I didn't disconnect my PC from electricity, just turned it off through Windows shut down).

When I press the power button, there is nothing powering on, no ventilators, nothing. I tried changing the power cable but the PC still doesn't power on. I was also thinking that the power button was the culprit, but then I pressed the power button which is directly on my motherboard and the PC still doesn't power on. What I noticed now at night (It's night here) is that there is still light glowing out of the motherboard's power button, I have no idea what does that mean. Is PSU or the MOBO the culprit?

I also tried unplugging the power cable and pressing power button a few times to get rid of excess electricity but PC still doesn't work. I tried plugging PC directly into wall socket aswell. Doesn't work.

What could be the actual culprit here?

PSU is LC Power Archangel 850W and motherboard is Gigabyte EX58-UD4P, both parts are 6 years old.

I really need my computer for work and I need to replace the faulty part ASAP, suggestions are wanted.

Thanks for further help and please excuse my English, it's not my main language.
 
What exactly makes this PSU poor, is LC Power bad brand or because of the fact that I had to wait a few minutes before the PC would power on after plugging it in electricity in the past?
 
I recieved the PSU, installed it, also replaced all the old PSU cables with the new ones, everything works as it should! :) PSU was indeed the culprit! I also don't have the problem anymore where computer would need 3 minutes before I could power it on after plugging it into electricity, I guess that was a half a year earlier sign that my old PSU was dying.

Thanks everyone for help, especially you SR-71 Blackbird!