For the past few days, my computer will not start up. It will turn on, but it will not run. I have left the "starting windows" screen on the monitor for hours on end to no positive result. I ran diagnostics on it, and I got a message saying "BIOS3-D NO BOOTABLE DRIVE DETECTED." I have a Hewlett Packard desktop that's about 5 years old. Has anyone else had this problem? How do I fix it?