TravelPilot RNS 149 can't switch on

[donny]

hi
just bought transit type 3 with mark 2 CI autohome camper body.
It has a TravelPilot RNS 149 fitted which I have'nt a clue about although I have the manual which looks pretty complex for my brain cells.
The blue light was flashing when I bought the van and I was able to play the unit radio and CD. Then the blue light stayed on when the unit was turned off. Now the blue light is off all the time and I cannot get the unit to turn on or do anything. I had no idea what a pricey bit of kit this was.
Please can anyone Help!!!![/code]
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donny