i presume there is power in your amplifier... here's some possible things you might want to check:
a. try it with just 1 speaker 1st... if it still will not work,
b. check if there are fuses inside the chassis for the speakers... it might be busted
c. don't know if you tried to input from a source already but if you did check if the cables are all fine..
d. if this are all met, i advise that you bring it to a technician already. some components inside might need replacement.
good luck sir...