PC Won't Boot

[Rival_]

Build Specs
i5 6500
EVGA 970 SC
ASRock H170A-X1
2x4GB HyperX Fury ddr4 ram
2TB Seagate barracuda
240GB OCZ Trion 150 SSD
Rosewill Capstone 550w PSU

System Age: 2 years

Hi, my PC recently stopped turning on and I am wondering what the cause might be. After a lot of testing I can only start the PC with a jumpstart on the mobo without the GPU in. Once the PC has started I can turn it off and on with the case button so it isn't that, that's faulty and when I try to jump start the PC with the GPU in, the CPU heatsink twitches and the LEDs flash on at low brightness. My guess is that the power supply is faulty and not supplying enough wattage or voltage and I'm just looking for other peoples opinions on what the cause could be.

 

[RARRAF]

Are we supposed too guess what the PSU is ?? but probably how old is it ??

 

[Andy_K]

Yeah sounds very much like the PSU is dying, best thing is to try a known good psu, and see if it works properly with that.

 

[RARRAF]

it sounds like it is PSU related