A friend of mine has a sony viao desktop. While working on it he accidently pulled the powercord out of the back. When he turned it back on it would not load windows. It got to the windows did not start properly page but none of the options would boot up. It was getting stuck at Mup.sys. Even safemode with command prompt faild to load. At first i thoght corrupt files. So i put in the XP disk to try to repair system. but it loaded the file and got stuck at windows is starting up. Changed the ram, disconected ide drives but still got stuck at windows is starting up. Any ideas. Could a power faliure corrupt the bios in any way. Thanks for reading and any help Paul from London.