Question PC turns on but then turns off after a minute ?

Gio_

Prominent
Jan 7, 2023
11
0
510
Hello there,

I just assembled my first PC and it boots but then turns off after a bit. The first time I booted it, I got it into the USB Windows boot and formatted the Recovery partition while trying to install, it worked but then it turned off randomly. I’m not sure if this is happening because I did that.

Now it won’t let me into bios or select another boot disk, because it freezes and turns off.

I was able to get into BIOS once but the CPU temp was reaching 100C and I couldn’t understand why so I quickly turned it off.

The SSD is from another older PC and it boots to that somehow but turns off after a bit and the motherboard shows VGA and DRAM and sometimes red BOOT LEDs, which then disappear. I tried switching the RAM sticks and I tried to remove the SSD, but if I do it lets me choose the boot disk and then it turns off. The buttons on the motherboard have lights that stay on even after the PC turns off so this makes me think it’s not a PSU problem. The screen on the cooler shows about 40 to 70 degrees C.

Specs:
MB: NZXT N7 Z790 (used from Amazon)
CPU: I9-14900K
GPU: RTX 4060
RAM: 32GB DDR5
PSU: Corsair 850W
Cooler: NZXT Kraken Elite 360 (used from Amazon)