But if you do that make sure you unplug anything that plugs into the PC before you do that, and touch the metal case before you touch anything inside. However, if the case hasn't been opened, there's no reason any of the connections inside should have come adrift.

This happened to me a little time ago, with a second hard drive, and it turned out it was a missing driver file. If it's that, it should be pretty easy to sort out, and Mario's advice about the help line is the way to go about sorting out out.