I have a tomtom one europe 22 have a flashing white x in a red o

SOURCE: TomTom GO 720 - flashing red circle with white cross on screen

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

SOURCE: My tomtom has a red

http://www.tomtom.com/support/index.php?Language=1&query=red+cross&FID=1898

SOURCE: A flashing white cross within a red circle appears

try re-setting the unit by the re-set botton on the back or side of the unit depending on the model

SOURCE: my tomtom 1 xl is giving me a memory card symbol

do you have an sd card loaded?
if so and it hasnt been formatted for the tom tom then this can cause your issue, also if there has been an sd card in the device and then removed unexpectedly you will get the same issue.
hopefully this answers your query if so please rate my answer accordingly.

Thanks

SOURCE: white cross in red circle on the tomtom screen

hi. i suggest to try a soft reset first. go tomtom.com select support search for reset select softreset select your device do as told when this is not enough search in tomtom for start up and read wht to do.