I turned my 300 on, placed it on the car mount, it turned off and would not turn back on. I thought it needed charging but when I try the charge light does not come on. Thinking it might be my car charger I purchased a new home charger. The charging light is not on when connected to either the car or house. I have also left it charging in the car overnight to no avail. I did notice that after I pushed the reset and then tried to turn the unit on there was a small flicker of green on the indicator light. This won't happen again until I reset the unit again.
SOURCE: GPS Won't Turn On
My 510 was doing the exact same thing.
I called customer support and they helped me get it working again.
866-486-6866 is the number but here is what they had me do.
I had to push down the reset button for 15 seconds (the reset is in a small cut out near where you plug in the charger on the bottom.you will need to use a pin and you will feel the pin push in the button if you have it in the right spot.)
Then release the reset and hold down the power button for 10-15 seconds. the screen should come right back on.
If you need more help I suggest calling the 866# they are very helpful.
SOURCE: Tom Tom Go 710 - Won't turn on
not sure but try an other device on the car plug to see if it works??????????? could be the plug.
SOURCE: Tomtom go 730 will not power up.Brand new,used a coupla weeks.
you need to do a hard restart. find tiny hole on under side by bracket mount and press it with a tiny paper clip once. you have to look very very close to see it. you can also try to hold down on power button for 5 to 6 sec.
SOURCE: my tomtom won"t turn on
If you have a tom tom from the GO models
they hace a reset button you can press with a pin were the mount fits.
When you plug in the charger the green light should come on to say it is chargeing.
Try the car adapter to charge the tom tom
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I have the same problem but not with 300, I have the Go720
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