What you describe with four holes and two screws may well be a terminal block strip just used for joining wires together - not a fuse at all. They look like this...
http://www.bikudo.com/photo_stock/85995.jpg
Bought in long strips and pieces cut off as needed.
Your lamp has LV for low voltage printed on it (12V) - it will be powered by a small transformer often hidden in the ceiling void - your transformer may have failed.
If you're not confident in diagnosing and repairing faults like this perhaps an electrician should be called in particularly for a fault in bathroom.
Good luck...
Peccavi
March 2010
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