Unable to boot from HD or Disc

Hi,
So i'm writing this from my windows HD which i am able to boot into fine.
I recently upgraded to 10.6, I had some issues so i decided to zap the PRAM, upon restarting and waiting for the progress bar to load at start up i get a dark grey screen slide down and 'you must restart your computer'.
This also happens if i try to boot from an os x disc or partition. Yet i can boot to windows fine..
I've tried resetting SMC, zapping pram again, safe mode, single user mode. I havent recently changed any hardware.
Any suggestions?
Many Thanks

The trouble is there isn't a list here of hardware (or graphic cards).
I was messing around with Snow Leopard and managed to mangle a hard drive to the point I needed to strip it and scan for bad blocks.
I could not boot with the drive present. Even once I had a new, good install of 10.6.1 up and running, returning the drive to any bay fails to start.
Good reason to not have Windows and Mac on same drive.
7300GTs are failing due, and I had 4 x 512MB Apple RAM I finally just pulled to rule those out (better off with just 4 DIMMs now anyway).
SL is compatible. OpenCL isn't being used or implemented. So anything from 7300-1900-2600-3870 along with OpenCL compatible, 8800GT, GT120, 4870, should all be "compatible."
There is no better way to recertify a drive and map out bad blocks, if WD drive, than WD Diagnostic Utility.
- to so overly generalize ("found my solution" "not overly compatible" "found information") is rather hazy.
Too bad the 8800GT isn't offered; and the 4870 over-priced (and PC 5870 to sell for $379 and at least 2x the performance level).

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