The tomtom was working fine. Then I think I left

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I'm using the TomTom Go 730T - I think this is the latest and the last TT with Traffic because TT stopped supplying this option. I'm having the same problem from time to time but a reset helps. Just press the Reset button and after restarting the traffic option is back. Janos

The plugs which are used with car lighters are often very poor; compare the firmness of the seating of the lighter with your accessory plug. The latter are often too loose to make decent contact.
Also, that plug is equipped with a fuse; unscrew the plug body and check the fuse.
I also recall someone having a failed plug on the Tomtom itself; it may be a weak point.

Try holding the power button in for about 15 - 20 seconds to see if it comes on, do this whilst plugged into a computer or your car.

My Rider 1 is showing the same sympton. Was working fine now I can't get past the initial "Tomtom" screen.

Does it power up when connected to the mains charger?- No, need to prod reset and then turn on manually.
Does it switch on when connected to the bike cradle? - No, only sign of life if by manually turning on but only get as far as the Tomtom screen, not the main menu.

Any ideas welcome

If the problem exists both when you use the vehicle power connector and the usb cable to your computer, then you have to assume that the problem is with the socket on the One. If it's still in warranty, I would send it back to Tom Tom for repair. Contact customer support for repair information.

The link is as follows:

www.tomtom.com

You may need to keep it plugged in and charged for a few hours before you turn it on again. I ran into a similar issue where there was no juice left in the battery, but after doing a full charge, it worked fine.

I did find out how to solve the problem. I can't remember exactly where I found the solution but I think it was on TOMTOM website. You have to connect to TOMTOM home and reinstall the application. I put the TOMTOM disc in the computer (which came with purchase) and reinstalled the program. Which I thought was weird as everything appeard to be fine with TOMTOM home). Anyway, it worked. Good luck.

In a back of your GPS there is a small whole. You have to press with toothsstick to reset it.

Amazing what reading through the support page at TOMTOM reveals... I have the XL so no SD card to remove, but the support page explains that a hard reset by holding the power button takes 15 SECONDS. That's actually a really long time if you watch a clock. I pressed it and waited it out, and it worked. Powered right up. Not sure if I lost all my favorites and stuff but I have them backed up using TomTom Home anyway....