My computer keeps randomly restarting. HELP!

[Dovahkiin153]

When I start up my computer it will start off fine, however when windows starts to load it will randomly restart, going through the bios again and starting to load windows before going through the process again. I've tried using a different hard drive with windows to boot from and also removed the cases buttons from the motherboard, yet the same thing happens. Unfortunately I haven't got a spare motherboard lying around to test if it is the problem. I plan on taking it apart and putting it back together tomorrow, however if anyone knows what is wrong and how to fix it I would greatly appreciate it.

[reapersivan]

Reinstall the OS?

[Dovahkiin153]

The same thing happened with a different OS

[fire219]

The same thing happened with a different OS

You have a hardware problem then. If it makes part way through booting, I'd bet the problem is the PSU (failing under load) or maybe some failing RAM sticks.

[★ Coups ★]

Is your power supply powerfull enough to power your components?

 

What components to you have?

 

What PSU and voltage is it/do you have?

[Dovahkiin153]

500W EVGA Bronze PSU

AMD FX 6300

2X 4GB Kingston HyperX RAM

ASUS something motherboard

500 GB Seagate HDD (OS)

1TB WD HDD

Powercolor Radeon R7 265

Windows 8.1 64 bit