What do you mean by no joy as yet? Have you been able to get it in to service menu?
If you were able to get to the service menu what did you do to attempt to fix it?
Are you following all of these step in this order?
1. Pull the batteries and replace with fresh ones. (If you are sure that you are using new batteries. Remove them, count to 10, then replace them).
2. Connect the usb cable between the GPS and your computer (with the explorist off).
3. Hold menu+up+power and the unit will start up in disk access mode (keep them all pressed in until you get a menu on the screen).
If you are having trouble with step 3 one trick is to press menu and up buttons first. Then once you are sure you have both of them pressed, press and hold the power button while continuing to hold the other two buttons. Remember not to let go until after the menu screen appears.
4. Once it starts up, browse the device in the windows explorer (or mac equivalent).
5. Go into Geocaches folder and move all the files in there to your pc (make a folder in your my documents to store them). Double check to make sure that there are no files in the Geocaches folder on the GPS.
6. Go into the Waypoints folder and move all these file as well (keep them separate from the geocache files from above). Double check to make sure that there are no files in the Waypoints folder on the GPS.
7. Eject (safely remove, etc) the GPS and pull the usb plug. The unit will reboot normally.
Thank you-I have already tried something similar, but I suspect I wasn't waiting long enough. I'll give it another go- thanks to all, will let you know what happens!