All warning and dash lights plus all gauges not working

I went into town, switched off, did shopping, came back, turned on ign. Everything is dead, only lights that come on are alternator and h/brake, car starts fine, those lights go out, drove 45km home, no prob, checked all fuses in engine compartment and boot with test light, both sides ok, checked main wiring harness which plugs into rear of the cluster, no prob. Disconnected batt, left it off for 5 minutes, and reconnected, hoping that the computer will reset. Did not work. Batt is new, alternator charging 100%. Blower motor also not working, yet the two control selectors(speed of motor, and position of air directed)light up when ign is turned on, even though the lights are not turned on.

All lights, indicators and electronic ignition lock working fine, I did say all gauges not working, speedo, tachometer, fuel and temp. Gauges. Horn ok. The high beam h/light in dash works, as do the indicator lights in the dash. Sorry, I do not know how to check for trouble codes, and finally, my C200 is a manual g/box.

Tough one hey!