A "clicking" in the hard drive can only be caused two potential things. One would be the rotating disk but the disk turns so fast (either 5400 or 7200 rpm) that you probably won't hear periodic click but more of a constant sound. The other item is the read head that moves back and forth across the rotating disk to write and read data. The spring loaded arm is actuated by an electrical impulse to a coil which causes the arm to move. On occasion, fairly rare, the arm will hang up so that when the electrical impulse tried to move it, all it will do is click from the mechanism that actually moves the arm. It's not typical that this will rectify itself so in essence as others have stated the drive is normally toast. ONE THING TO TRY: Here's what I'd do to try to get the arm to move. Remove the drive from the computer. You'll find it quite heavy as this is because of the heavy metal frame that holds the actual disc and the electro-mechanical parts inside. The drive is shaped like a rectangle so choose either of the two long sides. I'd slam the drive down pretty hard on a cement floor in an attempt to release the spring loaded arm that reads the data when it's functional. The drive is toast anyway, so you may as well give it a try. Once you do that, put the drive back in the computer and see if it will work normally. It may not and it just might. Good luck!!! I hope this helps.
33 Years Computer Experience & IT Support