Last night i installed apples latest security update. when it was finished, my computer rebooted. i started itunes, put on some ocean sounds on repeat 1, to go to sleep. i noticed the screensaver froze and shortly after, iTunes stopped playing. Imac was unresponsive. I rebooted, chime, apple logo, spinning wheel, grey screen nothing. Solutions tried: 1. pulling power cord overnight (heating problems?) 2. removing and alternating ram sticks 3. verbose mode (begins to work, but freezes after mentioning something about com.parallels started) 4. safe mode 5. single user mode (thought i had applejack installed but guess i forgot, tried fsck -fy. first pass always indicates error, 2nd pass ok, reboot yields nothing) 6. Target disk mode w/laptop. (doesn't mount on laptop) 7. safe mode (can't tell WHATS goin on there but doesn't get past grey screen) 8. boot from SL install disk (takes forever lots of noises, freezes apple logo and spinning wheel) 9. boot from Disk Warrior 4 sl compatible (takes forever lots of noises, doesn't get past grey screen) 10. Option key (hard drive shows up or SL install disk/disk warrior option depending on whats in the drive. choosing hd results in grey screen, bootable disk freezes apple logo and spinning wheel. 11. D key (apple logo, spinning wheel, grey screen....idk what SHOULD happen, but i don't think thats it) 12. CMD+Option+P+R (reboots, then apple logo, spinning wheel, grey screen) No beeping, clicking, or other irregular sounds, or chimes to be reported. whew...i think thats everything. ANY input appreciated. i'm at my wit's end trying to figure this out.