I have a 3rd edition tom tom and need to know how to update it

SOURCE: my tom tom one 3rd edition is stuck on power down mode an

http://www.tomtom.com/support/index.php?Language=1&query=connect+to+home&FID=7375

SOURCE: my husband bought me a tom tom one 3rd edition

Look at this URL: http://www.tomtom.com/services/service.php?id=16&tab=87

It has Download button for the PDF Manual.

SOURCE: Tom Tom only has Guam map since update

That is really strange!
I can only suggest that you verify what MAPs are physically on your TomTom device by connecting it to a PC/LAPTOP and use Windows Explorer to look at your GPS drive folders: should see a folder for each 'country' (like GUAM).
The normal way to check which maps are registred and loaded on your device is to use TomTom Home -> Update maps function: it will show you the status or whereabout of any Maps that you have loaded or backup and which one can be purchased.
Hope it helps: let me know how you go.
ps.i f you wisely backup your device on a regular basis (via TomTom Home or direct copy to your PC/LAPTOP), you could always RESTORE FROM BACKUP and start again.

SOURCE: I need to update the maps on my tom tom one 3rd

new road maps