I have a panasonic CD Stereo system model #SA-AK340.I was listening to FM then suddenly in the display i saw F61 and the set is not switching on again.Please help me find the problem.

Hi my son has the same radio/cd player.We were having problems with the cd player So we took it apart (not the first time)Well we couldn't figure it out so we put it back together.Now the code F61 ios showing.I have called all panasonic techs and not a ONE even tried to help me.They all have me different phone numbers and it as a circle.I know I don't have the money for a new one.We can deal with out the cd player,but nothing works.It comes on with a LOUD BUZZ(that the volume won;t control)then it shuts off.I tried the whole reset thing and that didn't work either.If you get any answers please help me.Thank you,KIm

holas