I shut down my PC last night - everything was fine and now today it will not boot up (it won't go past the black screen where it lists the PCI devices). I have inserted my Win XP cd and have attempted a repair. The computer has completed this, but is still not booting and now I am getting a green happy face on the screen (replaces the 'o' in serious bus controller). I have also tried to get into the computer in Safe Mode, but since the computer isn't booting up even that far I am unable to get in. Any suggestions??