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Possible blown fuse inside unit, unplug and remove the top cover
fuse should be near the power board and transformer. replace with exact fuse, "Never remove covers with the unit plugged in" Always wait 4 or 5 minutes after unplugging to remove the cover.Replace cover before plugging unit back in.
There should be two fuses on the secondary board of the main power transformer. They don't look like regular fuses - they are small round can fuses. These are probably open. HK under-valued these fuses originally, and they need to be replaced with 3.15 amp.
it sounds like Amp burned, but not all burn parts you can see, you have to measure them by DMM. I guess at least one AMP transistor shorted. you can check SPK terminals by DMM DC, it can be easy to find different with other one
First of all, if you have just been powering up with the remote, try pushing the actual button on the unit. From owning a HK receiver, I found out that if the power switch is out, it will not turn on from the remote. Duh moment when I discovered this. It also might be an internal fuse or circuit breaker that is shorted or tripped. If there is not an outside breaker or fuse, send this to a repair person. Sometimes there are capacitors in the power amp circuit that can hold a lot of voltage for a good length of time. You could get shocked. So, you might want to let the repairman handle this. Otherwise check for an outside breaker or fuse, and replace if needed. You can also check Harmon Kardon's site for customer support.