I first used the original BMW disc (i've previously tried lots of burned copies that did not read).

The BMW original disc did not read either.

Someone then suggested that I try a DVD version, so I burned a V32 ISO to DVD.

It started to read, and started to upload (hooray, I thought). But then, halfway through, it said there was an error, ejected the disc and said press OK.

I then put the original BMW CD back in to see if it would start again, but the power light went off, and the screen went black.

Now all I have is the radio, which works, but nothing on the screen, and a disc stuck in the MKIV unit that I cant get out.

I just tried a 3 mins pushing the eject button, then releasing and pressing again, but that didn't do anything.

I now have a black screen, no sat nav and no power light to the MK IV unit.

Quite a bit further back that I was before, which was just an old version of OS....