For the past couple of months or so I've been having some problems with my pc (which I built 2 years ago) which I thought I narrowed down to a single source, the psu. The plan is to do a breadboard for further tests, but just I wanted to run this against you guys in the hope of saving what might unnecessary steps in the troubleshooting.
My computer won't straight-up boot-up. I've found some workaround which has changed throughout the time I've had the problem, but the latest one I've found was where I would hold the power button, turn it off on the sockets, and then back on on the socket, then the computer power button in quick succession. I had always thought this was a PSU issue (a slight crackling noise that can be hardly heard, which disappears using the previously mentioned workaround), so I finally got round to requesting an RMA and sourcing a temporary replacement psu.
Upon using the replacement, though, the problem has exacerbated. It no longer powers on. The odd thing, though, is that if I take out the 8-pin cpu and PCI-E cable from the psu, it powers up — the fans spin and indicator lights on the motherboard light up. Which leads me to think it's not a psu problem. But if it was a motherboard or a case shorting problem, how is it that the issue is not replicated? What could be the likely culprit/s?
Any guidance is greatly appreciated. Hope everyone's day is going well!
Asus P9X79 PRO Motherboard
Seasonic X-660 (Temp. replacement is a Corsair AX-760)
GSkill Ripjaws Z Series 1600 CL 9.0 16GB Memory Kit Currently using 2 different low-end fanless GPUs (both working fine) and 6 fans in total
Running Windows and Linux