Hello 711. Welcome to the forum.
That click could indicate a head fault. A head fault is very bad. Therefore you want to proceed very carefully.
If it is a head fault (frozen head actuator, head parking issue) it is recognized by the infamous "Click of Death". Wikipedia has an audio recording of an instance of one.
Use the drive as little as possible until you have everything you need in place. If my guess is correct you may have limited opportunities to recover your data for free.
You want to find a data recovery program like RECUVA and a partition management program like PARTITION WIZARD. Install these and review their instructions. You will also need a backup source to put your recovered files on.
When ready, connect the external drive and try and recover your data.
If the recovery program can't see the drive then you could try Partition Wizard to rebuild the MBR. Then try and recover data with the recovery program.
If PW can't see the drive then it somewhat proves you have a hardware failure. In that case you can try the freeze trick.
You put the hard drive in a zip lock bag and place it in your freezer for a hour or two. Then you remove it and immediately and quickly hook it up and see if you can get it recognized. If so start recovering data immediately - getting the most important stuff first. If the freeze trick works to unstick a "frozen" actuator head it will tend to only work until the drive heats up. You can try to refreeze but subsequent attempts will be less effective. This process is damaging to the drive - it is a last resort.
Do not try and initiate or format the drive! The "good" news is that if this is a head fault then your data is intact on the platters. A data recovery company could then recover that data so long as you have not altered or destroyed the file table. It costs a lot more to recover the data if the file table is destroyed.
Sorry I could not bear better news.
http://lifehacker.com/5237503/five-b...recovery-tools