You need to get yourself a multimeter first,then check your input voltage(are you in the U.S or europe- 110v for U.S 240v for europe),if you have the correct input voltage then on your mulimeter check your fuse using either ohms or bleep test.The correct fuse value is 3.15amps,you should be able to buy this anywhere,I guess its a 20mm fire proof.By the sounds of things your mains in voltage is missing otherwise your chassis would show some sort of led activity.