Check CPU temps and fans / coolers are running correctly. Re-seat GFX card and RAM. Check power connections to GFX card and Modo. Check PSU line voltages in BIOS, if possible. There shouldn’t be too much deviation.
Disconnect alll devices with the exception of 1 x stick of RAM, boot hard disk, plus mouse and keyboard.
Just a few things off the top of my head.
Good luck!