A typical hard drive click, on average is a result of a previously mis-written piece or pieces of data. The clicking sound in that instance is the disk having a spasm over the fact that it thinks a piece of data is in one location on the disk, where it is actually in an another. This was typical IBM75GXP behavier. The ticking was a result of another problem, the ticking on average wasn't actually the thing which damaged the disk, it was a result of the damage. So that particular and quite common problem can be eliminated if a disk check finds no errors.

So for now, I think you're safe. My new Western Digital Raptors every now and again make a noise which could be mis-identified as the dreaded clicking sound, but I'm pretty sure it's perfectly normal behavier. Like I said, keep an eye on it, if everything is still well in a couple of weeks, I wouldn't give it a second thought.

Cheers