Hi ccfj1,

Took until very late last night to resolve the problem.

I have the maps on DVD and the OS update on CD.

Over the last few days, I have created about 6 "updates" to the navboot and installed all of them without any issues at all. ALL with the same Splash Screen.
Then last night, I changed a couple of colours on the Rom 2 & 3 maps ONLY.

Then I went to the car and updated as usual - everything went OK with the update. I removed the CD as instructed, and clicked OK to reboot the Nav.
After it rebooted, the splash showed OK, then it asked me to insert the Map DVD. I did, and the map showed OK. It was then that I clicked on the Nav Menu button and it froze. The freeze lasted about 10 seconds, then it rebootewd again.
This happened 3 times, so I removed the DVD, switched off, and set about reinstalling my original OS to restore it.
That is when it would not recognise ANY disc I put in it. OS or Maps.

I read around on the net and saw a recommendation to disconnect the battery terminal to reset the cars electrics. However, while I was searching the net for an answer, I had locked the car. By the time I returned to it (20 minutes +/-) I thought I'd give it one last try.

Thankfully, it read the disc and reverted me back to the original V32 OS.

A bit reluctant to try any more upgrades !

Thanks again for all your assistance mate