How to investigate rebooting PC

Ags1

Honorable
Apr 26, 2012
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I built a PC a year ago and it was stable until I installed a Sapphire RX480 Nitro. After that the PC increasingly rebooted spontaneously - up to every few minutes. At first I blamed the graphics card, so I put an old card in and it was stable for a week and now it is crashing again. I've checked all the connections in the computer.

What can I do to investigate further assuming the problem continues after my attempts to check connections?

Also, my modular power supply (Cooler Master V550) has the annoying problem that the power cables will not click in place (hence my concern about the connections).Is there any way I can secure them in place?
 
Solution
Just looked up both GPU's, the 430 has a max around 49w whereas the 480 can use over 160w. You may not be gaming but it only takes something triggering the gpu to throttle up to full speed for a fraction of a second to push a failing psu over the edge. I can't guarantee its the PSU but I think its likely.
Just looked up both GPU's, the 430 has a max around 49w whereas the 480 can use over 160w. You may not be gaming but it only takes something triggering the gpu to throttle up to full speed for a fraction of a second to push a failing psu over the edge. I can't guarantee its the PSU but I think its likely.
 
Solution