I have a Zenith DVD/Stereo Combo home theatre system. I bought it about 3 years ago. It worked very well until recently. It made a pop noise while operating and the unit powered off. Now if you try and power up the reciever, it will emit a high pitch frequency for about half second and completely shut down. If you try and power it up again, nothing happens but if you unplug the unit, wait 2-3 minutes and plug it back in, the unit will enter standby mode and the red indicator light will be on. Then if you hit the power button to turn the unit into active mode it will emit the high freq. noise again and shut off. Any advice you can give me on what the problem could be and how to fix it would be greatly appreciated.
Thanks, Craig