I have a SUPERTUNER 3D EEQ mosfet radio / cd player . this is in a vehicle that i purchased in December. I had to replace the battery in the vehicle this week . The vehicle was without a battery for 2 days. I installed a new battery and now the radio will not come on. The fuse in the main fuse box of the vehicle is not blown. Is there a fuse at the back of the unit that could have blown. any POINTERS AS WHAT TO DO NEXT.