Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A341 Safari/528.16) This has just happened. Whilst doing some encoding a message suddenly appeared saying I had to restart. Everything had sort of froze. So I restart and get to the apple logo but then a grey screen comes down saying restart again and big lines of code appear. Straight away booked in for genius appointment but that's not till wednesday. Anyone know what's happened?it's a 24" iMac. 4 g ram. Only 4 months old.