Well, I am at a loss. It still sounds like the video card to me. I suppose if the monitor is not handshaking correctly when signaled to change resolutions in normal mode, that could confuse the card - you could try another monitor.

Another wild guess is the network connection in normal mode is causing problems - I have seen some strange symptoms resolved simply by replacing the network cable - try disconnecting from the network.

Have you scanned for malware? Try running through Cleaning Out Malware.

ok my PC now somehow started normally. Is there is anything you suggest i can do now?? Cuz I know if i restart there is a big chance it won't come back...
I'm not going to restart till i get ur reply :-P

Backup your critical data!!! Other than the suggestions already presented, I don't have anything new to offer.