I have a Toshiba DK96. CO lines are going dead and some displays are dead. If you push a line button, you hear a beep but no red light lighting up on the button.

I rocked the power switch and it works for about 2 minutes, but then same problem occurs with lines going dead. There are no in-use lights and the processor still has a heart beat. All while this is happening.... could the trouble be the processor, or a bad CO card or station card?