when trying to reinstall windows xp on my dell laptop i get hard drive not found. I ran the dianogistics and the disk drived passed. Any answer suggestions
Try going into your System Setup (usually by tapping F2 during the power up cycle) and there should be a way to reset your BIOS back to factory settings. That will get the BIOS to search for, and connect to, hardware devices and hopefully it will locate your hard drive.
You can find more details on entering system setup in the owner's manuals available on http://support.Dell.com