A lot of people are having the same issue after the update. Since you cant connect it to computer, my best advice is to get it replaced unfortunately.
i can get it hooked to computer, and work with it using a computer.
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SOURCE: TomTom GO 720 - flashing red circle with white cross on screen
Hi, I am back, just got the problem solved, I called their tech support at no charge (866-486-6866, Glen) , really good service.
First turn your firewall off (if you have one). You need to go into your 720 with the TomTom Home software and erase the downloaded software (with the remove items from my device) and reset the device (little reset button under the unit keep it pressed for 5 seconds), place it back in the cradle and restart your computer and than restart the 720 , bring the TomTom Home program up, and when the TomTom Home software in your computer restarts and detects the 720 it will tell you that you need to update the application, if it doesn't than you force the update by going to the add maps option, select items on my computer, select applications and press the add button, when done, go back and to device (option in top of your screen) and select disconnect device, restart your 720 and it should be back to life with the upgraded software.
Hope this helps
Aldo
SOURCE: Tom Tom one reset itself and now stuck on language
firstly don't use tina when you're done with the setup change the voice to Tina again
or download TomTom Home
SOURCE: screen won't respond
you need to turn it off ,
and hold the reset key down for 60seconds
whilst the reset button is still pressed ,press power button.
if that does not still work , power up normally and hold the reset key for 60 seconds whilst it is powered up,even if it goes off do not rellease the reset button unitl 1 minute has passed
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