Ok today I turned the pc on as normal

The bios splash screen came up it's a DFI lanparty board btw
and it just stuck on the post screen no error messages it just hung

Well after much messing about I discovered if I leave it in this
state for about 10 minutes it comes back alive and boots into Vista
as normal and performance is as good as always

I have tried to reflash the bios but still the same thing
Anybody any ideas I did a google search but nobody
seems to have had the same fault