when I try to boot up my external, I get a whirr, 1 loud click, additional whirr, 1 loud click and so on. it does this 3 or 4 times, then stops trying to spin. thats bad, isnt it?
That is the noise of the head seeking back, trying to read, giving up, and seeking back, repeat.
You can google for information on freezing the drive to try to recover data in a small time window, however, it will damage the drive so should be used as a last resort only.