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If everything else is working fine, specifically the touch screen, then it's probably your speaker. open unit and check your speaker for anything stuck to the back of the magnet (on the speaker). make sure the cable going from your speaker to the keypad PCB (board) is pushed in all the way. you may want to even pull it out and re-connect it. make sure the unit is off while you do this and try to ground yourself with something.
good luck and let me know how it turns out.
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i use to own a 700, i advise you to get the new magellan mastreo 4000 or higher,i did my research and the magellan700 roadmate is no longer being serviced.that is what the magellan website has had showed and someone on here also has said it and they start to have alot of problems.i own now a mastreo 4000 so far so good no problems.
The most obvious question is, have you accidentally turned down the volume to a level where it can't be heard. There is a volume wheel on the unit. Also, there is a way that the sound can disappear if the unit gets "locked up". But that shouldn't be a persistent problem. Removing the power cord and reinserting it should clear that problem.
Does the initial Magellan screen appear? If it doesn't display anything and it's just blue... :( Normally means that something on the main board is your problem. Which, means your out of luck. What happened to it? It just suddenly stopped working? Let me know.