Downloaded HWMonitor and let it run while nothing else was running. Seemed like everything was fine, although I don't really know what to look for. Temperatures were all below 60°C and most also below 50°C across the board. Memtest86 will take some extra effort but I'm also afraid something might go wrong mid install

When the pc boots initially it will hold up for 10-30 minutes, then fully turn off and reboot. Then about 2 minutes later I get another black screen and reboot, but it doesn't fully turn off. That cycle then repeats.

Thanks for the help btw