Hi all, First time poster, long time lurker. I have a rev A macbook air that has decided not to boot. This morning it felt quite hot (even for it), so I decided to reboot it to clear any rogue processes out etc. It didn't reboot. It got to the white screen with the apple logo and that's as far as it goes. Down the bottom, a progress bar comes up and fills to approx 10%, then disappears. A new progress bar comes up, fills to approx 10%, disappears and is replaced by the spinning "loading" thing (not the colourful ball, just the circle). This is as far as the machine goes. I've tried booting and using control/command/p/r etc but so far it just sits there on that white screen with the grey apple logo and the spinning thing. I'm worried the HD may be dead; I have no external cdrom drive or anything to try booting off, so that's my lot. Any ideas? Thanks!