PSU possibly dying. Troubleshooting tips?

[Stg-Flame]

To the mods, sorry if making multiple topics across different sub-forums is against the rules, but time constraints are somewhat forcing my hand.

Anyways, to make a long story short, my PC randomly stopped working the other day after using it with no problems. The fans and LEDs on my case spin/light up but the fans/LEDs on my motherboard, CPU heatsink, and GPUs did not start up. Upon tearing it down to bare minimum (PSU, CPU, and motherboard) everything came alive when I pressed the power button. after adding in RAM and my HDDs/SSDs, the LEDs on the motherboard lit up for a moment, then turned off, though the CPU fan was still turning. After adding a single GPU, motherboard LEDs and CPU fan didn't even come on.

Is there anything I can do to fully test whether or not my PSU is dying and not my motherboard? I've had a lot of gaming rigs in the past, but this is the first time I've ever came across a dying/dead PSU or motherboard.

 

[TemjinGold]

Can you get another PSU to test? Also, it would help if you actually told us what PSU it is as well (I notice it's not in your sig).

What happens if you ONLY add ram to the bare min (no hdds/ssds)? What happens if you add just 1 stick and not 2 (assume your 8gbs is 2 sticks)?

 

[Stg-Flame]

Sorry about that. My current PSU is a Corsair Gold80 TX850W and the only other one at my disposal is a 450W Corsair in my old gaming rig which doesn't have sufficient power to test my current PC.

As far as the bare minimum goes, both sticks of RAM have no immediate effect to the system and only when I start adding HDDs and SSDs, it will start to drop fans and LEDs. With one stick and one HDD, the CPU fan ran for about two minutes before stopping and the LEDs slowly dropped off shortly after the CPU fan stopped. Adding more hardware just means less comes on when I press the power button. Adding a single GPU has the whole system come to a screeching halt which leaves only the case fans and LEDs working.

 

[TemjinGold]

Your 450w is more than enough to test the ram/hdd/sdd/single GPU.

 

[chubbyfatazn]

Your 450w is more than enough to test the ram/hdd/sdd/single GPU.

This. Though I'd set everything back to stock volts/frequency just as part of the debugging routine.

My basic testing routine usually goes: cpu at stock, one stick of ram at stock, use the CPU's integrated graphics (if present), and start with just the 24-pin and EPS 12v power connectors. Add the boot drive if you wanna get past the bios. And then anything else one-by-one.