power to amp, yes, pushed button next to mpu scrolled to section 8 checked volume, yes, video and slot machine up and running ,yes ,also opened up video and found no blown caps or unplugged wires ,yes ,also you tried plugging a set of head phones into the green plug in on the side of the video box yes and there was sound there but still nothing coming out of the speakers, so you have tried everything and still no sound, well I was there to so here is what I tried and figured out what was wrong, go to the amp which is behind the video screen, reach through and unplug the upper right speaker wire plug and hit the reel spin button and see if you have sound I did there was a short in one of my bat ear speakers and that stopped all sound for the whole game something else you can try is unplug one speaker at a time to try to figure out which on is bad. Here we go, ok so you have no sound, first thing you have checked, wires plugged in, yes, amp good, yes.