repaired disk/permissions, now imac won't boot into login My iMac has been running horrendously slow the past couple days, so I booted into the Snow Leopard CD and ran a disk repair and a permissions repair.  Now I can't get past the spinner.  It's been going for about 4 hours now with no shows of progress.  Does any body have any ideas on what else I can try (I already tried doing the repairs again) or is there any way I can debug this?
There's a free app called AppleJack that's good for ths kind of thing. If you don't have that, Apple Hardware Test may help.