IMac Suddenly Very Slow-But Not Slow in Windows?!?

This is very odd.
I have a brand new iMac, no more than a couple weeks old.
Just upgraded to 10.6.3 as well with no issues. Now i booted into Windows 7 with no issues, But when i tried booting back into Mac OS, Start up took 10 mintues, and when i'm using finder etc, it locks up for a few minutes then finally regains some function.
Now it's not a app issue, tried Safe Mode, no apps or start up items etc running to cause this problem, Ram is good, 8GB, Per Disk Utility, Hard Drive SMART status is Verfied, and Disk comes back as no repairs needed. Tried Reparing permissions to no luck, ran Hardware test, all passed, booted from external 800 drive with much faster results. Tried PRAM reset to no luck either.
To me, it seems like such hard drive issue, but as i'm writing this, i'm booted into Windows 7 since on the Mac OS side, it seems to lock up the Hard Drive.
Booting into Windows 7 seems to run at full speed with no lock up or freeze issues.
My specs are iMac 10,1 3.33 Dual Core, 8GB Ram, ATI 4670.
So any ideas what to do next??

Me too, hard drive 'clicks' and 'knocks' on start up or even just randomly during use. Had a kernel panic too the other day where it didn't find any bootable discs.
I think the HD is on the way out but this system has been fine for years under leopard and windows XP. It began about a week or less after I upgraded to snow leopard and windows 7.
Similar problems seem to have been reported many times before albeit under slightly different conditions yet no fix is forthcoming from Apple yet it seems.

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IMac Suddenly Very Slow-But Not Slow in Windows?!?

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