hi i have a mercedes c200 cdi se on a 54 plate it wont start here what it is doing when u put the ignition on the rev counter is going up and down there is a load of warning light on, the fuel pump is surging and the fan kicks up but when u put the key into start position doesnt crank the engine any ideas

 

fixed it it was the front sam control unit and engine wiring loom u useless set of tossers