SAT NAV not responding

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I have disconected the battery but nothing changed.... Im constrained to use only with cd on the drive even for the other parts of menue? Or the cd is only for navigation??
 
Yes. Screen is turns on. When i pres 1 time the first button the menue change the color.. If i pres for second time then the display turn off. If i press for 3-rd time he turn on with menu
 
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