New
#11
Well because your PC is rebooting even in the BIOS I still think it's hardware, sorry I posted the disk check link twice (Updated now).
Can you run Prime95 in safe mode, that will help us rule out a software issue.
Well you can try running your laptop on battery and see if it reboots (charge it when you go to sleep or when it's off).
Run SeaTools as requested earlier as I've updated the link.