Further check of system. After squirting the selector knob with electrical fluid yesterday it now seems to be working ok, can move the curser without it jumping and can make radio selections on the stuck FM freq Band. So relieved i dont have to take the selector assembly apart!!

Ckecked battery, and the Hydrometer colour is green, which indicates it doesn't need charging or replacement.

After selecting ignition switch on, control panel display temporarily shows computer menu before then changing to Radio FM band showing all pre memory radio stored channels for that band.

Unable to make any selections on radio panel, that is change functions to CD, Cassette Tape, Select Freq Bands, or turn radio off by pressing on/off Knob.The Menu button also doesn't work so cannot revert display back to computer display, very annoying as at the moment i cann't use the Sat Nav or TV.

I've checked all fuses and re checked the function of Sat Nav Map CD and loading new CD's in CD Changer in car boot.All seem to be working ok.

Cann't really think what else to do ----Any further suggestions would be welcome.