I have a old receiver and now it is in protection mode. I have unplug the speakers and all cables but it is the same. It started to glitches in sound in Md/Tape when i played music from the computer. Sometimes it stopped playing and i had to move the cable out and in. I first thought it was the cable but now i guess it is something else. Now it is in protection mode without any cables in. I checked the fuse and it looked whole. It starts sometimes but no sound comes. Then it is protection mode again.