My old desktop did that when the heatsink fell off.
I'm having issues with my PC. I was sitting in my community's VOIP browsing the internet for Skyrim SE mods and all the sudden my PC just crashed. No blue screen or anything. I turned it back on and it just started up, got past the BIOS and then shuts back down. Unplugged/plugged everything and tried it again and same results. Very seldomly it gets past the BIOS and get's to a Win10 screen saying repairing installation, once it gets there it shuts down before any options get selected. I tried to boot it in safe mode, and it shuts down even before I can select safe mode.
I put in the system restore disc and manage to get it into boot options and whenever I try to select the disc or even a different HDD with a windows install in it, it still shuts down.
Anyone know what could be causing it?