Sometimes fails to boot

[IM back!]

My pc often , about 1/2 of the time dosent post, it sits there when turnd on fans running at 100% and dose nothing no post no video no hdd lights no beep code. if it turn it off and then on agen it works fine. specs:

amd 5200
geforce 8800gts (g92)
2gb ram ddr2 800
M2N68-LA (proparty mobo)

[Sylvander]

Replace your CMOS battery with a good one.

[IM back!]

Now it blue screend during boot (before micosoft windows logo).

Replace your CMOS battery with a good one.
ill try that but its not loosing the time or any thing

[Sylvander]

1. "Now it blue screened...before the Microsoft Windows logo"
Does it blue-screen before or after the BIOS attempts to load an OS off some disk?

e.g. What happens if you [try to] boot some bootable floppy or optical disk?

[mjc]

Actually losing time is not the primary sign that it is time to replace the battery. In fact some configurations don't use the battery to keep track of time unless the computer is unplugged from the AC outlet.

[IM back!]

Does it blue-screen before or after the BIOS attempts to load an OS off some disk?
after, I use grub to dual boot and it pops up before the blue screen

[IM back!]

seems to works fine now arter i used a different wall outlet