I experienced abrupt power loss yesterday while the machine was booting up, it then started giving me a message that files were missing and/or corrupt in registry (c:\WINDOWS\SYSTEM32\CONFIG\SYSTEM). The real problem is once I put in the install disc to try and run the recovery console, it refuses to boot the optical drive. It blinks for a couple seconds after I initially put the disc in but doesn't even attempt to boot with it. Changing boot priority did nothing. To test out whats going on I put in a secondary hdd I have laying around with Win XP pro on it (its all functioning), it tries to boot up that drive but shows a blue screen for half a second and then the system restarts automatically. So right now I'm sitting on my main HD experiencing a corrupted registry (i believe) and my motherboard refusing to boot from optical and failing to boot from the secondary hdd. Please help.