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There is a small hole on the tomtom device base. Inside it there is a reset button.
Press it and turn device on.
Try to turn it on while connected to the electricity, if it is a battery problem it should work
If it doesn't work I suggest you to bring it to a tomtom support center.
If that does not work use the hard reset underneath the tom tom with a paper-clip to re-set your device. press the reset whilst switching on the TOMTOM but don't press too hard and let go once you see the screen coming on.
You need to plug your TOM TOM into a PC with Internet connection and go to the tomtom web site: www.tomtom.com
You will need a usb cable that has the "mini" usb standard connector that plugs into the TOM TOM unit. It should update automatically, but you will need a TomTom Home account (free) created. Then you can download the latest updates that should clear up the power issues. Otherwise, get a new power cord as they do wear out with daily use.
One suggestion is to plug the Tom Tom using the temporary power cord to you home circuit (not the power source from the car). That worked for me. Sometime the Tom Tom shuts down when left in the hot car requiring a reset. Then the best way is to plug in at home and restart. Try it, otherwise I can't help.
I suddenly lost the GPS signal today and could not get it back. All I got was the "No valid GPS signal". My solution was to tap on the GPS satellite bars when in the route map. this brought up the "Status summary page of the TOMTOM.
I then again tapped the satellite bar which brought up the "GPS Status" page. I then tapped the bar labeled "configure".
The radio button next to the option titled "Minutes (dm.m') was selected. I then moved the selection to "Degrees (d.d) and it started working.
I had just downloaded the GPS fix 5 days ago so it is not like this suddenly caused it to stop working.
This may not work for everyone but this is what it took to get mine working.