Sitting here playing HL2 (yes, it's fantastic and I really should have gone to bed 3 hours ago but that shows just how good it is...) when all of a sudden the pc unit about 2 feet away starts making one hell of a racket, and I nearly shat meself. One of the fans had split and was clacking against the side of the casing. Luckily they were 99p each from ebuyer and I bought a stack of spares, so 2 minutes later and I'm back again...