Need some help diagnosing a pc problem.
First time happened a few weeks ago. Shut down pc before bed, next morning I notice pc is still running(screen is black/off). Can't do anything except turn off power. Try to turn back on but nothing happens.
After opening up, cleaning, and generally checking all connections, power suddenly comes on and works again, and continues to work fine, until today.
Same problem, shut down last night, this morning screen is off but computer is still humming. Powered off then won't start up. Opened, cleaned, checked, no obvious issues, still can't power up.
Changed power cable, suddenly it boots up!
Shut it down and moved power cable to original power socket, won't power up. Maybe it's power socket..moved back to one that worked, won't boot up again.
Little power light on motherboard is always on when switched on.
I'm stumped at what's causing this, thought it must be psu but why sometimes it works and power light inside is on.