|Two computers tend to be a good test.|
To diag it, you might look at usb current draw. Might remove hard drive from case and connect it to some other usb to drive device or connect it directly to some computer.
My guess is, it is bad. You shouldn't have to do anything except plug it in.
To be sure, get the owners manual online for it and read it.
A Pit Bull is like a gun you can pet. And there is no safety on it.