My tomtom just stopped working one day and has not turned back on. it is charged but it just wont turn on.

SOURCE: tomtom wont turn on

If the green LED comes on OK and you have tried a re-set with a paper clip through the reset hole and it still won't switch on then the most likely cause is a blown chip inside the tomtom. This can be caused when you start your car. The extra strain of turning the engine causes voltage spikes to arrise in the cars wiring , just as your starter motor turns. Unfortunatly this extra high voltage , called a "spike" can damage the tomtom. Only solution is to take it to a specialist repairer or to return it to tomtom for repair. Don't let your average electronics shop have a go they are more likely to make a mess inside . Its a specialist job !

SOURCE: tomtom wont turn on

http://www.tomtom.com/support/solution.php?GID=1&PID=233&SID=0&CID=152&Language=8&FID=6965#reset_button

SOURCE: tomtom GO 910 GPS stopped working

Mine is about three weeks old and just did the same thing. I ahd been using it while walking in a town in Germany. So I did not even have power/docking or PC problems.

I reset the unit with a paper clip. Look in the mounting opening at the lower rear of the 910, there is a small cut out. press this carefully, mine is now back to life and did not even lose my 'recent' list.

SOURCE: I can't turn my TomTom 130 on. Charged it for 3

Try doing a reset. Hold the on/off button down for 20 seconds.
Hope this helps

SOURCE: when driving with my tomtom turns its self off

It is (most often) the problem is in Safety Preferences'
Tap 'Safety preferences', then 'Done', then "done" again, then 'Done" again, then select 'Never' for "Turn Off Map Display'