I have downloaded every BackTrack from remote-exploit.com, burned all of the ISO's to a CD, made sure the CD's were bootable and checked the boot order. For BackTrack 1, 2, and 4 Beta, it just goes to a black screen with a flashing line on the top left corner. For Backtrack 3, it's usually the same thing, but one time, I got to the login screen, but it wouldn't accept the default "root" "toor" username and password. Could anybody tell me why none of the backtracks will work on my computer please?!