Originally Posted by Michelle (UK)
On mine the previous owner has obviously had something constantly stuck in it which had pushed out the internal prongs causing it not to work. Make sure the power is off and simply stick something in to push them back out again.
Worth a try...
This is likely the case. I've found that something similar to dentist pick is an excellent tool to reset the prongs, assuming of course, that the power issue is dealt with beforehand.