I have a Hitachi AX-m68D stereo, which comes with cd player, DAB tuner and amplifier. It was working the other day fine but then yesterday when i tried to power it up there was no life in the unit when pressign any of the buttons. i turned it off at the mains and left it for a while turned it back on then the radio section powered up ok and i could change channels but no sound came out of the unit and i could not change the function to cd, Aux etc or turn off with the off button. I have left the unit un plugged for 24hrs and tried again but still the same problem. i have removed and cleaned the cables on the back bt still no life. Any thoughts would be much appreciated?