Hi, does the key turn in the ignition?
Ok, and when you turn the key to start does the starter crank the motor?
Are you able to move the shifter into neutral?
Ok, did you try a jump start yet?
no but battery seems to be charged
It would be a good idea to try that first but this sounds like a fault either with the K40 relay module, transmission module or ignition switch.
You are going to need to have some tests run to check power to the various systems.
The K40 relay module powers up most of the critical modules in the car.
OK - FYI i spilt the smallest bit of coffee on the shifter area (less than 5 cc) this morning just before the failure message came on
Liquid in the shifter can certainly cause these symptoms as well. If the system does not recognize that the car is in park it could act this way.
A diagnostic scan with the Mercedes tester can check the status of the park position switch in the shifter.
can I manually move the shifter in and out of park - is there a way to release the park
Yes you can, standby for the procedure
OK moved it back and forward but still won't turn
It was worth a try but I didn't think it would help.
any further suggestions
At this point you need to get the systems scanned to see whats going on. One thing that you can try is checking the fuses in the K40 module.
The module is located in the passenger side module box under the hood.
OK - this would be the driver side for me as its RHD
You will need to remove the cover on the box and you will see a module with fuses pushed into the top of it. Check all of those fuses and see if they are blown.
I think it is still the passenger side for you.
All of them fuse box is on left hand side of car as I look at car from the front, right hand side as i am sitting in car. No fuse box on my passenger side
It's not a fuse box it's a covered compartment, usually 4 screws hold the cover on.
how do i know if they are blown
You either need to use a test light to check for voltage across them or remove and inspect each one for a broken fuse filament.