Compaq desk pro 2000 bios

It seems that compaq uses the F10 command to enter BIOS but... in order to use it, you must first install Compaq's "F10 Setup and Personal Computer Diagnostics" found here
Note that it is for the following operating systems; Microsoft MS-DOS, Microsoft Windows 2000, Microsoft Windows 3.1, Microsoft Windows 95, Microsoft Windows 98, Microsoft Windows NT 3.51 so if you have upgraded your OS to Vista, XP or Win 7, you'll need a different version but you should be able to find it from that link.