When the amp is turned on does the unit make a clicking sound a few seconds after the display lights up.
if not the amp's is not happy with it's power or could have a speaker short. Check the display for a fault warning.
Otherwise check you speaker connections.
confirm that and A and B main speaker buttons are correct.
Try some headphones, if you get sound out of the headphone things might not be too bad, if nothing is output remove all your cables and try again.
Yes I know that can be nasty, so label all the cables first.
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