My computer, as mentioned above, has a constant shutdown error, and also will not 'wake up' if I leave the computer on overnight (ie. screen is black.) No sleep mode is enabled. Have to fully turn off power, reset will simply encounter an error on startup. Other that these two problems, computer is absolutely stable. I have had these two problems with this computer basically since delivered to me (pre-built, software installed) which would indicate hardware problems, but damned if I can find them! Memtest is perfect (11 passes last night), hard drive scan faultless. I'm hoping it is some corrupted driver. I do not use anti-virus/firewall (or think so!). Was hoping to resolve this myself however the windbg can't sort its symbols out. Much appreciated for any light shed on this annoyance!