Big problem with plain blue screen on boot (not related to Leopard install)

Hi - eventually I have worked out how to post to this forum!
I have had a major disaster with my iMac this weekend. It began with a lock-up when I was working happily away in Blender. I got a beachball and the machine froze. I had ssh set up so I tried to go in from my iBook to kill a few processes to try to get it back on track, but without success, so eventually I had to hold down the power button to power off the machine.
When I tried to reboot, I got the grey screen and the spinning wheel, then a plain blue screen with no mouse, no beachball and the machine just seemed to stop. I could hear the CPU going like the clappers and was able to ssh in again and check top to see what was going on, and the WindowServer(?) process was maxed out at 100%. I wasn't able to kill it and again nothing happened and on a further reboot I just had a plain blue screen.
I have since spent a few hours trying various things to sort this out, so far to no avail.
- Single User mode, fsck -fy: reports everything fine, no change
- Reset PRAM, no change
- Tried booting off my backup Firewire drive (SuperDuper) but it won't boot to it, same blue screen hang
- Ran Disk Utility from Leopard Install DVD - permissions, checked disk, etc - no change
- Ran DiskWarrior in Target Disk mode from iBook, no change
- Ran Tech Tool Deluxe, no change
- Removed RAM (not third party), put it back in, no change
- Reinstalled Leopard using Archive & Install, no change
- Reinstalled Leopard again, using Erase & Install, no change
- I think I'm running out of options.
I'd have been on the phone to Apple by now but it's Sunday tomorrow and a Bank Holiday in the UK tomorrow so it will be Tuesday at the earliest, and I know I'm going to be frustrated by having to go through all this with them again!
A weird thing is - I CAN get logged in in Safe Mode now and again, and when I do, the mouse pointer has a small, almost transparent rectangular graphic attached that follows the pointer around. Barely perceptible but it's there - it looks like a Leopard icon for a txt file but barely visible. Has anyone ever seen anything like this?? It really feels like something has corrupted, but with a totally clean OS install, is that possible?
As it stands, I'm sure this is a hardware issue but I'm not sure. I had a couple of power outages lately which I suspect are behind this.
I'd be really grateful for anyone's thoughts on this - it's been a really frustrating couple of days.
Cheers.

As far as I can see, resetting the power manager on this model of iMac involves resetting the SMC, which is unplugging all cables for 15 seconds, plugging back in and powering up. Tried that too, same result. In terms of third party software, nothing. Clean Leopard install is the lot.

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Just ran a recent update, and computer woke up with plain blue screen and spinning beach ball, was it the update that made the computer crash?

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SYMEFA.SYS is a Symantec driver. If you have any Symantec/Norton products, I suggest you remove them. It's necessary to tear them out by the roots using their tool
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Bug Check Code    : 0x00000050
Parameter 1       : 0xbff59c01
Parameter 2       : 0x00000000
Parameter 3       : 0x837505ba
Parameter 4       : 0x00000000
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Product Name      :
Company           :
File Version      :
Processor         : 32-bit
Computer Name     :
Full Path         : C:\Test\Mini081910-20.dmp
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Hello!
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Big problem with plain blue screen on boot (not related to Leopard install)

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