Pc shud down without warning

Last night I took my PC apart because of a display problem, I removed the GPU, RAM slots, the CMOS battery and the CPU. The problem was fixed and the display works now, but the PC shutsoff a few minutes after turning it on (shuts off when the Windows 10 boot logo appears). I believe this is...

Hello all, My pc is quite old (around 5 yrs) but I dusting regularly. I encounter weird problem since last 3 days. After I booting up my pc, it suddenly turn off after few minutes. Then I turn it on after 1-2 min, again It turn off. (quicker this time like it might heated up). As I suspect...