Computer Stopped Working

Oct 17, 2018
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Hey guys and girls!
I would really like your help here...

I was randomly on youtube and my computer just turned itself off - now it won't turn back on. I tested my PSU with the paper clip and the fan spins. I can still charge my phones via the mobo's USB slots. My power button's LED works fine. When I press the power button, the CPU's fan jitters slightly for 0.1seconds (this only happens 1/10 times you press the power button). HOWEVER, the mobo's gold LED lights are not showing. So... is this a CPU problem or MOBO problem? Thanks!