Computer hangs at boot for 5 mins, then starts fine?

[powdaman]

Got new machine recently. And when I turn it on it hangs at the Vista Loading screen (which is slightly greyed out) for 5 mins.. then just starts fine?

anyone know what could cause this?

 

[powdaman]

Good point regards USB devices - I'll unplug them this evening and check.

with regards to spec:

AMD Phenom quad clocked at 3.8Ghz
2 x Solid State drives in RAID 0 (60GB per)
4GM DDR3 Dual Channel RAM
Sapphire 5870 G/card