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A likely cause is that the battery is "dead" ... i.e. no longer holds a charge. The GPS runs on battery power, even if it is plugged in. It will work even if the battery holds a (small) charge. But if the battery doesn't a charge anymore, the device will not start up, even when it is plugged into a power source.
If this is the case, you'll want to change the battery.
If you TomTom is not coming on after a long sleep.. I.E. more then a few days with no use, try this......
(1) Plug the unit into either a PC or your Car (2) Wait for about 2-5 minutes to get some charge into the unit (3) Press and hold the power button for about 15-20 seconds until you see the start-up screen
Why did it die? I have found and many other have found the battery does not live long without a power supply to charge it, it would seem to me even thou it is powered off, the TomTom is still sucking away at the battery and it would seem there is nothing that can be done about it.
well the reset button is behind the front face cover. However I doubt this will do much for you.
Reasons for not connection. 1) Battery is too low and needs full recharge via AC adapter 2) Poor position or being overshadowed by buildings or other electronic devices
3) Dead SIIRF chip caused by starting motor with the GPS plugged to DC power. Might work a 100 times without problem 101 kills it. The whole mother board needs to be changed. Cost often exceeds value. No device should be connected when staring engine. Even a fused DC adaptor somketimes does not blow the fuse when spiked and will allow enough spike to pass to kill this delicate echip. Even mobile phones will suffer this problem pooof! gone within 10 seconds!
The eraticness may be a faulty charged batterty but I doubt it.
Poor vicinity for a strong signal A low battery ***** must be fully charged The DC is only maintenance charging and eventually goes flat. A damaged SIIRF CHIP caused by starting the engine whilst the GPS is plugged in. A failked fuse to keep battery charged for maintenance in the DC charge unit.
Try recharging battery( or replacing it if 2 years or more of age)
If it is plugged into the car, you use the DC charger. You can charge it using the usb port on your computer as well. In the accessories section of tomtom.com you will find an ac adaptor as well that can be purchased to charge it to an electrical outlet.
you may have a faulty device as you have tryed it with and without the cord, or may have blown the fuse inside the device if you've plugged it in to too high a voltage, check the voltages match for your truck and device. If they do you should think about a new battery. Or else if it is new return it to dealer. The only other cause is you have corrupted programme inside, this can be fixed by USB in to your computer and visiting www.tomtom.com form all the downloads you require. If your computer cannot see the tomtom and any SDcard aswell, when connected, the device is at fault.