A few days ago while browsing in Safari, the dreaded spinning rainbow wheel popped up and it ended with me having to turn off the computer (by holding the power button, I couldn't move the mouse pointer to turn it off normally). After that the CPU has been operating at what seems to be maximum capacity. The fan sounds like it's on max as well (as if I'm running loads of heavy apps when in fact I'm running none). When I start it up it usually goes several times between my desktop (without icons) and a blue screen before it turns on "properly", and sometimes it doesn't even do that, it just shows the menu bar, desktop background and spinning pointer wheel and nothing else comes up. When it does work it goes dreadfully slow; videos hang for several seconds, opening folders takes time, etc. etc. What the hell has happened? My iStatPro tells me this about the CPU: User: 70-80% System: 20-30% Nice: 0 Idle 1-2% There's plenty of inactive and free memory and I've got more than 7 gigs of free space. Is there anything I can do besides letting Apple fix this?