Ive got a weird issue with this board.

If I turn of the electricity at the mains overnight when I turn on machine, fans start then machine shuts down. Everything starts as normal second time round.

As long as I don't turn it off at mains machine starts up and shuts down normaly.

Ive got an e8400
4 g.b of G.Skill pc 8500
2, 74 gb w.d raptors in raid

and a 600 watt seasonic, running with vista 64 bit.