Hi, I turned my Macbook on this morning. Everything initially went fine, you have the sounds of machine checking the CD drive, but there was no startup sound--I dont have the volume on mute, so it should have chimed. Prior to the grey screen with the Apple logo the screen was off for about 5-10 seconds. I just tried turning off and on again and it did the same thing. Anyone know what this might be? :s Thanks.