|The HP link below shows some generic specs for that model. Try clearing the CMOS while the computer is unplugged. You can do that with the CMOS jumper, or by momentarily removing the CMOS battery.|
I just reviewed your #2 response. The error you are receiving does not necessarily indicate a faulty hard drive.
Have you checked the boot order in the BIOS (setup) screens. You get there by tapping on of the F keys at start up. Watch the screen for instructions on what key to hit.