Okay, don't know what happened. but all of the sudden I got a message when trying to boot my computer. "The file is possibly corrupt. The File header check sum dosen't match the computed check sum" this was located on the black screen in white writing. Now if I go to turn it of and take out the battery and try again, it won't boot up. I'll either get that message, or it'll be in sleep mode (and won't come out of it) My husband has managed to unscrew and rescrew some screw on the underside panel, and for some reason this allows it to boot up. What's going on, why am I getting this message. What do I do to fix it? I need help fast getting it to boot and stay on. I have college to do :(

It is possibly a Root Kit. This is a virus which has replaced system files with ones that have a virus in them. Screws would have nothing to do with this it is just that you had rebooted enough times that the root kit got replaced with a Windows backup. A checksum is a comparison of the system files with the last known good file baseline. This error is saying the system fie had been modified since the last baseline. Windows has a backup of these system files and will automatically replace them for you. The problem is if you have a virus it will continue to change these files. If this is the case then get a malware removal program. It may not be a virus, it could be an update that went wrong. If the file did not download properly then it is corrupted. If this is the case then roleback your last update.

I might doubt the rootkit but they do exist. The thing is it seems like the computer is not booting past post. That should mean a bios issue. Sure the bios can have a virus. Dunno about the screws deal. If you need this then you should at next time it boots correctly, you need to make a complete backup of your important data. To troubleshoot this you need to offer more information as to the boot sequence and what all you see. Can you access the bios. Do you see any other text while booting and such. Any odd lights that you might notice. Playing to the angels Les Paul (1915-2009)