My computer starting doing this about a week ago. Turning it off for a few minutes would result in a normal boot and all was well software wise after that. Now I cannot get it to start at all, it just stops at the Bios Boot Screen. Pushing Del to get into the bios does not work but ctrl-alt-del will reboot the computer. Any ideas? First thing I am going to try is memory. Also I had a situation for a long time in which bios setting are not retained despite replacing the bios battery. RT