I think I know what the answer is, but gotta ask it anyway. Got a friend's laptop that's 3-4 years old. First the keyboard stopped working, so he got an external one. Then he confirms there were "other problems". When he gave it to me, it wouldn't boot. Starts to boot Win 7 but never completes. I changed the BIOS boot sequence such that everything should boot before the HD, but when I put a bootable thumb drive in a working USB port, or a bootable DVD in the working DVD player, it doesn't recognize anything. This is even after pulling the HD! I don't have the tools to test, but I presume it's a pretty safe bet that the MB is toast. Your thoughts?