Was working fine and then....

Ok, my mac was fine yesterday.
I have an Imac 20" inch 2 gb of ram...
I had shut it down, and I turned it back on. It came up but started running sluggishly. So It ended up freezing, so i held the power button down. Now it's stuck at the apple white screen with the little spinning thing. I have logged in via single user mode, and tried to run fsck -fy... It gets to checking catalog file... and sits... then an error comes up....
Failed to issue COM RESET successfully after 3 attempts. Failing...
then
AppleAHCIDiskQueueManager::setPowerState(0x4079c00, 2 -> 1) timed out after 190049
I don't know what to do. I just need to know if its the hard drive took a crap or something more serious... or if something simple... I don't have a retail cd but I am trying to find one...
I have boot camp installed, and windows booted up once... Ran fine for a little then kinda froze... so i'm not sure... Is there something i can do if i can get the windows side running? Please help me out as I have no idea where to look up error codes...
I also tried target mode from my powerbook to my imac... and it just kinda freezes when I try to look at the volume..... anything... Please help...
Thanks in advance,
Samuel

well mine was a bad hard drive... that was the problem... Now whether or not an update can cause a hard drive to fail.... not sure.... But i bought a new 500gb hd off of newegg it was only $60... so not too bad... Taking apart the mac sucked though... hahahaha.... get a suction cup... and lift the screen... i broke my hd temp sensor though... so the fan was running at like 5000 rpm.... i got fancontrol and went to the terminal and found out the correct command to set the hd fan to MAX speed of 3500...
/Applications/smcFanControl.app/Contents/Resources/smc -k F1Mx -w 3e80
everything is working good now...

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