Help PC boot problems

[dysfunction]

My PC has started developing a few random errors.

Firstly:
It doesn't boot up and says I must insert a system disk.
A quick restart and it boots fine. Chkdsk doesn't report any errors either.
And then it boots fine for a week or so after that.

Secondly:
It tells me I have a keyboard error/can't find the keyboard.
The only way around this is to plug in a second keyboard (my spare isn't a USB) boot the pc then unplug the 2nd keyboard and all works fine again for a week or so.

Any ideas as to what could be causing this?

I get no other error messages at all...

Thanks!

 

[xane]

Check the BIOS and make sure its not resetting stuff, could be the battery, especially if it resets after its been left for a while.

 

[dysfunction]

What sort of things should I check?
I don't really see anything that is "wrong" in the BIOS settings...

 

[dysfunction]

Ah well my PC has probably had it's final bootup!
So...soon I have my grubby hands on this:

i7-950 3.06 GHz
Asus P6X58D-E Intel X58
Corsair 750 Watts CPU
6GB Ram
+ other stuffs

Can't wait for delivery!!

Quite a step up from my old AMD 4600...