Computer Turns on Then Turns Off

[ClayTech]

I recently have done a case swap with all my parts, and when I plugged in everything seemed to be in working order. The motherboard beeped and started windows, then it randomly turned off. I’ve been looking on YouTube and replaced ram, no, took out graphics card, no, bought a new PSU nope. Any solutions????

 

[SchizTech]

Have you ruled out overheating? Is the CPU heatsink 100% secure over the chip?