Rt2300r problems When i turn it on it clicks on then turns off, I have check all the fuses and tried another power source what is my problem

This receiver is infamous for loose connections inside of the unit due to corrosion, heat, cold or age. UNPLUG the unit from 120VAC, then open case. Disconnect and reconnect the connector from motherboard that goes to the thermister (heat sensor) on the big 120VAC transformer. It's right there on the top of the transformer, not hard to find. Then, disconnect and reconnect the smaller low power connectors which are located on the motherboard just to the right (if the front of the receiver is facing your belly) of the big 120VAC transformer. This may just fix your problem. Wiggling and disconnecting/connecting other connectors within this unit may cure a multitude of other symptoms, too...Just make sure and disconnect the unit from the mains and, as always, stay away from those large capacitors no matter what equipment you're messing with.

One or more of the audio output integrated circuits its bad needs to be replaced by a technician