More info please. What kind of drive is it? SATA? Did you open the case? Change the drive? Tell us about the last time it worked and if any changes were made, etc.
Anyways, first I would go into the BIOS and make sure your laptop sees the drive. If no, you may want to make drive's cables are connected properly. Also make sure the drive spins up. If yes, then please give the info in my first sentence.