unplug the machine,and leave it with no power for 20 mins,
after 20mins repower and see if the fault has cleared,
if it remains the same,isolate the power again and take the lid off the machine.
Remove or disconnect the wires off the main board giving them a light spray with a water dispersent or silicone based anti static soloution.
Remove and replace one connector at a time, ensure connector and terminal sprayed is secure on fitment.
If that doesn't get it working then its a new module (expensive),
paul, March 2012
