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what source are you using?
try rotating the volume knob a few times as the contacts can get contaminated.
if source is ok, power is ok, but no output then not sure what else to suggest.
btw there is this thread:
https://www.lfgss.com/conversations/156217/?offset=11125#comment16612079
edit - just seen where you say you are using a phone via an aux lead - anything else you could try?
This seems to be the default audio/hifi thread now (please direct me otherwise if I've missed one!) - basically, I picked up a lovely (looking) Rotel amp just before lockdown - RA-312. It worked perfectly when first plugged in. Then, my mate moved in with a full DJ/speaker set-up so we moved over to his gear and mine went back in its box. Not touched since, just tried to set it up again not getting the slightest hum/crackle/noise through (into epos speakers and just trying a phone via an aux lead) - I've checked the fuses which are fine. Power light coming on so seems like that side of things is working. Any ideas/things I've overlooked/stupid mistakes anyone can think of that might cause this? It was an ebay bargain so I'm not too fussed if I have to move it on but obviously I'd love to get it working again. Cheers