920T; downloaded N American map to internal and all worked. Then from TomTom Home I change devices to external card and choose update and it prompted me to DL the Eiuropen Map but also a 720-920 NavCore file. All worked but now unless I remove the internal card I get no sound from internal (or external thru FM speaker) for instructions. It will "boot" with no external card will output voices with card removed. From preferences/voices/Change voice/test voice I get no sound unless card is removed. Can anyone offer up some ideas. I was stupid to DL anything but the European Map to the external card. Oh yeah, I had to remove MP3's to make room for the European Map and after DL'ing the map I moved it to the computer hard drive and copied the songs back. Evidently DL'ing the operating system to the external card makes it look there for voices. I tried "manage maps" and of course only have the North American now to choose. Any help would be appreciated.