Hi all. I just got a TOMTOM Go 720 (used to have a 510). I have two problems. One is that when i try connecting to my computer it says that the 510 device is the GPS connected and I can't change it to the new 720. The other problem is location... I started to set it up using TomTom Home and entered USA as location but somehow it thinks I'm in Guam. It keeps coming up with TAMUNING GU. When i try to enter my city it says no cities found (because it's in Guam). I have reset the device but that did not clear it. Can anyone help me? TIA, Ellen