Technics SU-G91 OVERLOAD PROBLEM

Question

I have a technics su g91 amplifier and speakers a and b will not work and i believe that it has to do something with the "over load" icon being lit up.  I was wondering what that specific icon represented and what i can do to fix it?

I HAVE THE SAME PROBLEM WITH MY SU-G91, BUT THE LED DISPLAY DOESNT WORK EITHER, MY OVER LOAD LIGHT COMES ON WITH WHAT EVER I'M PLAYING "CD PLAYER,FM STEREO ETC." WHAT CAN I DO TO FIX MY STEREO AND HOW MUCH WILL IT COST ME TO HAVE IT FIXED?