WD Green 750 GB drive spins up and then won't read

I recently was unable to start up my computer. It kept saying it could not find Windows. I checked bios and the drive that had my OS was not found. I changed sata cables, port, and power with no luck. I also tried a USB dock. The drive spins up makes a clicking noise a few times then stops spinning. It is the same in the computer as in the dock. Any thoughts?