Can't Boot after crash, even in safe mode!

My Mac froze while idle with Lightroom open. It may have hung while remotely copying something off an external hard drive.
But now it won't boot even in safe mode with all USB peripherals detached (including the hard drive that I might have been copying from).
In and out of safe mode, I get the same behavior. After the sound and the grey apple appear, there is also a progress bar, which I don't recal seeing before. It takes about 30 seconds and the progress bar advances about 10-15% of the way and then just power's off.
Is it the main disk drive?
This is an iMac that is several years old with all of software update applied. I don't believe that any software updates were applied recently. I assume that the 10.6.3 update was installed.
Is it the main disk drive?

I had the same problem on my MacBOOk Pro and iMac on 14th April - i had to reformat the harddisk and could restore from my Timemachine backup to the last 10.6.2 state only. Both happended after updating to 10.6.3. But my laptop was sluggish. Based on feedback, I reformatted my hard disk and carried out a fressh installation from my snow leopard disk (10.6) and updated it to 10.6.3 using the 10.6.3v1.1 combo update about a week back. The machine was definitely faster - but yesterday, the same problem reoccurred - the machine froze and would not boot even in safe mode. Repairing the hard disk using the boot CD did not work either. Just now I reinstalled Snow leopard from the OSx CD - it has replaced the OS and left all apps and data intact. I have upgraded it to 10.6.2 only.
My desktop iMac has been running without problems on 10.6.2 for the last 3 weeks. In my opinion, the problems of freezing (reported by others) and this one here are all related to boot sector corruption due to some problem in 10.6.3. There have been some reports suggesting that after 10.6.3, the CPUs are heating up more. The CPU temp was close to 70 deg C when on 10.6.3 - it maybe that some change after the update makes the processor overrun leading to this boot sector corruption - it generally happens slowly over days or weeks slowly accumulating to a break down point.
My suggestion from my experience over the last one month, is stick to 10.6.2 - don't update to 10.6.3. I am hoping Apple will fix the problems in 10.6.3 update soon.

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