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you need to check the power supply input of your amplifier using a multimeter set your tester into a dc voltage reading.then measure the power input you must have a DC voltage supply reading..open the cover check the fuse an open fuse will turn the unit to no power.there are causes of blown fuse a shorted power transistor at the circuit will blown the fuse you need to replace faulty transistors before putting up a new fuse...check also the diode at the power supply section ,faulty diode could lead to the same problem..
Suspect an overload in the power section, or more likely the main amp. A semi-conductor device is now acting like it was a piece of wire. Easy to spot with an ohm meter, it will just like you have touch the test probes together! My guess it will be one or more of the things on the big heatsink that's gone.
if the fuse blowes when you swtich the power on its the power supply circuit. if the fuse blown after a short while that the Amp is on its possible that protection circuit is short
if you want to fix the Amp let me know