External HDD Issue

[squashington]

After a couple years of use, my WD external HD is having a hardware issue.

The USB input on the back got pushed inside the hard drive. I'm guessing I plugged in the USB cord with too much force. So, I took apart the casing and retrieved the piece thinking I could put it back and everything would work fine. Well, apparently there's 4 little pins on the bottom of the piece that connect to a green circuit/motherboard(?) type thing.

So after replacing the piece the computer still doesn't recognize the hard drive. How can I fix this? I have around 160GB on the drive so it's pretty important to me.