Clicking sound .... I've heard that as well.
I have a old WD Passport drive that used to work on my desktop. In hind-sight, I realize it stopped being recognized when I upgraded the MBO. From that time on - worked only on occassion. So, I bought a new external HDD.
In the last couple of days, I read somewhere that this sort of thing can be caused by not enough power on the USB port, thus not enough to properly drive the HDD.
So, I pulled out an old USB 2.0 powered hub, plugged that into the same port on my MBO, plugged the WD into the hub and ..... magic! It works again!
I have to wonder if the power on the MBO ports is, maybe by design, just enough for things like thumb drives, but not enough for "real" drives?