When I turn on I get Flashing red circle w/ white X

1. Remove the SD card
The card needs to be formatted properly first that's all,

2. formatting is better done in a card reader. with a windows computer

3. Right click on it and select format select FAT32 as the files system

4. Now connect the tomtom but don't let tomtom home run. exit TTH if need be.

5. You now ned to select your tom tom which will also show as a drive.

6. In windows explorer select tools then folder options. Click view and tick the box for "show hidden files and folders"
It may warn you but you can ignore it.

7. Then just copy ALL the files from the tom tom to your sd card

8. DO NOT USE CUT AND PASTE !

9. Once all the files are on switch off the tom tom and insert the sd card

It should now work

This works for most tomtoms so there is nothing to loose and everything to gain

Remove the SD card

The card needs to be formatted properly first that's all,

formatting is better done in a card reader.(opionions vary)

Right click on it and select format select FAT32 as the files system

Now connect the tomtom but don't let tomtom home run. exit TTH if need be.

You now ned to select your tom tom which will also show as a drive.

In windows explorer select tools then folder options. Click view and tick the box for "show hidden files and folders"
It may warn you but you can ignore it.

then just copy ALL the files from the tom tom to your sd card

DO NOT USE CUT AND PASTE !

Once all the files are on switch off the tom tom and insert the sd card

It should now work

First turn your firewall off (if you have one). You need to go into your 720 with the TomTom Home software and erase the downloaded software (with the remove items from my device) and reset the device (little reset button under the unit keep it pressed for 5 seconds), place it back in the cradle and restart your computer and than restart the 720 , bring the TomTom Home program up, and when the TomTom Home software in your computer restarts and detects the 720 it will tell you that you need to update the application, if it doesn't than you force the update by going to the add maps option, select items on my computer, select applications and press the add button, when done, go back and to device (option in top of your screen) and select disconnect device, restart your 720 and it should be back to life with the upgraded software.

At tomtom.com I found a link to download the new version of tomtom home. For some reason when I plugged in my tomtom to my computer it wanted to download an old version of home and that would not install the applications to my tomtom. After downloading the new version of tomtom home everything worked fine.

I was able to speak with Tech Support at Tom Tom and got sent some links for solutions to these problems.  I was able to solve the problem following directions from this website.  Without that response of the support person to this specific problem, I would still be without my new GPS system.  Turned out that there is a conflict with the MAC OS and updates to Tom Tom, but there is a solution to this that worked for me.
If you get the continual red circle with blinking "X" and recently tried updating either your maps or most recent app, here are the two web links that will solve the problem:
www.tomtom.com/10324 (to disable SPOTLIGHT from causing a conflict on the Tom Tom ONE)
www.tomtom.com/9091 (general info for removing software and re-installing software to the Tom Tom ONE)
Do the disabling of SPOTLIGHT first, then remove and re-load software for Tom Tom ONE.  Good Luck.  This did the trick for me.

Hi - have had the same problem - if you look on the tomtom website and support they have a list and one is flashing red cross. You need to follow the steps to format the tomtom. I did this and it worked and it included the update. i havent reconnected since i have it working now. I think its a software problem with HOME. Make sure you do a back up on home and make sure you follow step by step. close HOME before you start to reformat and also in the preferences turn off the automatically connect to home when you plug into your computer or it keeps flashing up on the screen to correct. the only solution is to format it. i bought mine two days ago and the first one stuffed up so took it back for a replacement. this one worked when i turned it on but turned out the flashing cross appeared when connected to computer (i have a mac). good luck

Ah, another case of the Red X. No worries, it can be fixed. Most likely your connection was interrupted during an installation or removal of software features. Follow this guide to get your TomTom back up and running.

Complain to Tom Tom ,you may have a lemon,look for law suit soon

1 Have you got Tom Tom home installed on your PC?
2 Have you got Tom Tom in the home 'cradle' with the usb lead attached?

I have both and have no proba at all

Hi, I am back, just got the problem solved, I called their tech support at no charge (866-486-6866, Glen) , really good service.
First turn your firewall off (if you have one). You need to go into your 720 with the TomTom Home software and erase the downloaded software (with the remove items from my device) and reset the device (little reset button under the unit keep it pressed for 5 seconds), place it back in the cradle and restart your computer and than restart the 720 , bring the TomTom Home program up, and when the TomTom Home software in your computer restarts and detects the 720 it will tell you that you need to update the application, if it doesn't than you force the update by going to the add maps option, select items on my computer, select applications and press the add button, when done, go back and to device (option in top of your screen) and select disconnect device, restart your 720 and it should be back to life with the upgraded software.
Hope this helps
Aldo