Sorry mate, i tried my best to help!
being an S50 i doubt its under warranty?
best bet might be to stick it on Ebay, as spare or Repair.
This might put you off having another navman?
but my S80 3d with free TMC updates is the dogs nuts.
Have had Tom tom before and to be fair the Navman i feel is more accurate and has got me lost less than than my old Tom tom.
Most modern mobiles will double up as a half decent sat nav these days.
Anyway All i will say, is read reviews and compare prices before buying.
Halfords did have some good deals on, but be aware that some of the heavily dicounted models are old discontinued stock and unless you can get free updated maps, you could end up paying £30+ for updated maps.
best of luck .
