not working

Could be a couple of things. Depending on the age of the fuse the fuse could have just blown from being to old. here is a list of things that could blow a fuse.

1. old fuse - replace with new fuse see if the fuse blows again

2. power surge. - was there an electrical storm? Is the wall outlet working properly? - replace fuse

3. electrical short - something is loose or not grounded properly. - check wiring and for lose connections. check power cord. - replace fuse

4. bad component on electronics board - a component such as a transistor might be going bad and drawing to much power through the circuit. open the unit up and check the circuits. If fuses keep blowing then there is definetly a component going bad. 

-hope this helps