I'm willing to bet it's not in any Dell manual that came with the system, but how familiar are you with MoBos? You'll want to look for a stand-alone 3-pin group. Two of the pins will be connected by a jumper, the third will have nothing on it. You'll want to unplug the PSU from the wall first, then remove the jumper from the first and second pins and place it on the second and third pins. Leave it there for about 30 seconds just to be safe, then place it back on the first and second pins. Plug the PSU back in and start the system. You'll get a BIOS error message, so enter Setup and fix the date/time, then save and reboot. If that was the problem, POST should detect the new Drive, and when it goes to load, you'll get another type of error message since there's no OS on it.
If POST cannot find the new Drive, enter BIOS and see if it's listed.