I put all the old maps etc back in the 270 with the intention of 'screwing it up' when it was back to
original condition but I managed to screw it up (easily done by me) by accidentally booting up with a
GUPDATE.GCD set as version 5.00 instead of 500.
It now shows GARMIN.....blank screen.....GARMIN......blank screen and won't switch off and
the USB connection is not recognised by the PCB.

So, it's gone back to Garmin...........I'll let you know what I get back in '10 working days'