As I still haven't got to the bottom of it I thought I'd ask you lot 
The main pc I use died on me about 10 days ago. On a reboot just stayed a blank screen. Tried disconnecting 1 thing at a time but still nothing, ended up down to main hard drive and dvd r/w drive and still blank screen, not even as far as memory check. So reset cmos and it came up, went into bios and reset the date etc. saved and exited and back to blank screen. Reset cmos, pressed F1 to ignore smos settings, halfway booted into vista and BSOD! Reset cmos again and booted to vista dvd, into repar console and did chkdsk c: /r let it run but still doing the same thing...
Fitted new stick of ram, no difference. New motherboard, no difference. New hard drive, no difference. Only thing left is processor and I can't see that causing it! Any opinions?
I suggest you stop whatever it is you are doing and concentrate very hard on diagnosing the problem.
1. the PC died about 10 days ago
2. you reset BIOS and now get the BSoD
3. No matter what you do or have done since:
a. you still get the BSoD
b. symptoms are now different
4. if you have ended up with 3.a the reboot to Vista Safe Mode
http://www.computerhope.com/issues/chsafe.htm#03
5. if you have ended up with 3.b please explain exactly what you get once you power up.
