Hi there guys,
My computer's been slowly dying for a while now - I have issues with my graphics cards I think, but now an issue with my hard drives has popped up.

The graphics cards sometimes do not work on boot, so it hangs on the motherboard bios screen, then beeps and says OVERCLOCKING FAILED!
The only solution to this is to push F2 (load default values) and then it usually works okay, although it cannot handle heavy graphics.
I have (sorry it's a bit vague, just woke up, also it's a long time since I built the thing);
two ATI Sapphire Radeon HD2600
M3R32-MVP ASUS Motherboard
AMD X2 (Dual Core)
ATA 500GB HD

The hard drive issue is much more recent than the graphics issue (I think they're dying or I haven't configured them right..).
When I boot, about two-thirds of the time, it fails, and says;
ata5: softreset failed (device not ready)
ata5: softreset failed (1st FIS failed)
and loops through those two errors amongst others that basically say the same thing.

Any help? I'm lost and I need the PC working!