Hey there, SoarinSoars.
It's not uncommon for a faulty drive to be causing such problems with the whole system, so you'll have try some troubleshooting suggestions, to see what happens.
Are you talking about an HDD dock station? Can you access the drive at all? Do you need to recover data? What are the functions that stop working when you connect the drive?
I'd strongly recommend that you try the HDD in question by connecting it internally to a computer, to see if the same thing happens. If you don't need to recover data, I'd also recommend that you download the HDD manufacturer's diagnostic tool and run the tests, to see if anything unusual pops-up.
Hope that helps. Please let me know how everything goes.
Boogieman_WD