My Tom Tom One 3rd edition battery will not hold a charge. I plugged it in to my computer and to my my 12V in my car but to no avail. The little light on near the on/off button on the top of the GPS turns green when plugged in. The sounds or jingle at start up are heard but no visual then it goes dead when unplugged.. Have plugged unit overnite but the same things happens all over again. Louise

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 700 will not turn on.

Take a look inside your tomtom go . The photo's uploaded are of the GO and Go 300 / 500 / 700 series so yours might not look exactly the same but will be similar to these. SEE PHOTO of the IC's highlighted RED. U24 is on the same side of the circuit board as the card reader. U25 is on the same side of the board as the power socket. These are the 2 chips / IC's that will be blown if reversed supply or more than about 6 volts has been applied. The blown components are usually blown due to attaching the WRONG charger or a faulty charger. ( the tomtom cigarette lighter leads often go faulty ) These IC's are very very small ( just 3.5mm across ) and the 10 pins ( 5 on each side ) are even smaller and very close together therefore normal soldering ability will not allow a novice to replace them. Special soldering irons are needed , magnifying glass or special microscope for electronics + a steady hand and good light. Its highly unlikely that a home repair is possible. Besides that , even engineers with years of soldering experience have great difficulty replacing these components and it often takes me 30 minutes just to replace one of these IC's and I have a steady hand. Most normal electronics repair companys cannot repair this type of component as they will normally deal with bigger things. So unfortunatly, your "corner of the street" TV repair shop won't be able to fix it for ya either. As far as I know TomTom don't repair these IC's either as its too fiddly and time consuming and for them not worth the effort. Your only hope is one of the repair people offering this service on online . Try a look on ebay under "faulty tomtom" .

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: Tom tom not charging up!

Battery's probably dead. If you're within warranty you can have it replaced by contacting TomTom. Otherwise, you can still use the device, you'll just have to have it always connected to the charger.

SOURCE: my GO 720 tom tom won't start

You need to press and hold the power button down until you see the screen come on.