Linux freezes after overclocking, still freezes afterwards

[core 2 duo dude]

I just recently overclocked my Linux system ( core 2 duo E8300, Amd radeon hd 5870, Gigabyte ep45-ud3L motherboard) but it kept freezing ( no mouse or keyboard, or monitor i/o) so i set everything to default, and it's still freezing.

what should I do???

 

[Rapajez]

What distro of Linux? It may have been corrupted during the OC. :/

Have you tried resetting the CMOS on your motherboard?