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i don't know what you want, if you want your screen off when playing music touch the off button and music will continue but if you want the screen to stay on go to settings display and find what you want there, there are options.
just to confirm this is the nuvi 750 unit? if it is something else let me know.
Turn the unit off, and then back on. Now Slide the power key to the left and hold for 10 seconds the unit turns off. Turn the unit back on, it should work normally.
if you still don't have sound, try playing some music from the unit - Touch tools, media player, touch source to open the music player, trouch browse, touch a category, to play the entire category touch play all.
if you don't have any music in the unit (mp3 files are supported and you can load them to the memory card or with a data cable over your computer)
Double check that you got the volume turned up if you don't hear anything, from the menu page touch volume and then touch the speaker icon with the waves coming out of it to adjust it up.
if the sound is still gone, lets reset the entire unit and restore it to factory settings.
Enter the maintenance mode as shown on this video by holding your finger on the bottom left corner, sometimes the right corner of the nuvi and once in maintenance mode select clear all user data, that will reset the unit back to factory.
To turn the Backlight on, move to the Main menu, select Backlight, and click the Select button. The Backlight will come on and your iPod's world will be a lot brighter. After the current backlight time passes, the Backlight will turn off automatically.