TomTom One V3 wont start

[zot]

My TomTom One V3 wont start up properly. It seems to be stuck on some sort of diagnostic screen (see picture below). The power button doesnt work, the device doesn't show in Windows when I connect it to the USB cable. Pressing the touchscreen doesnt do anything. All I can do is press the reset button, at which point the TomTom restarts, I get the TomTom logo displayed for a few seconds with the drum sounds and then the diagnostic screen appears again.

Anyone got any ideas on how to fix it?

 

[dhn]

That certainly is the diagnostic screen. One reaches that screen by holding the power button on the unit and KEEP holding it through the reboot process till the diagnostic screen appears.

First thought ...............can you tell if the power button is sticking when you are holding it?