In following on from above:
Also check to see if the amp has internal fuses and depending upon the location of the
breaker (as discussed above) There could be a variety of causes.
If the
breaker is on the amp, check for any additional protection (fuses – both internal and external), unplug all inputs and outputs from the amp, turn the volume to 0, inspect the
power cord and then try to
power it up again.
If it is an external
breaker, check any other equipment that is also on that particular
circuit, as it may not be the amp causing the beaker to trip. Or, test the amp on a different
circuit.
Once you can give us a little more info, I am sure that we can help you isolate the cause a little more efficiently.