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First, check your software firmware version and see if there is an update. If available read your manual how to do a firmware update using your USB port, if you don't have a manual, check Bose.com for their online manual and firmware updates. I had a different problem but the firmware update solved it.
Another tip to increase the depth of your bass, while doing the adaptiq process, cover your bass speaker with a pillow, this will make your bass more deeper. You need a second person to cover your bass module with a pillow. in this way, the adaptiq process cannot hear the bass sound and it will increase the bass. You might need to do this several times until you get the desired bass sound. If you have not setup using adaptiq, your better off not using adaptiq, the sound is much better.
Hope this helps.
First check if your nuvi is not on mute by touching the button next to the volume that reads mute, then you try to increase the volume. To increase the volume:
from the main menu,
Touch the volume,
Then you adjust it with the left and right direction button to increase it or reduce it.
If that does not solve the problem, then you need to reset the nuvi, by holding the power button for about 15 seconds. It will restart itself. Or you can remove the battery and install it back in. If that does not solve the problem, then it is an internal problem.
Hold the VCR/DVR button in and press the ON/OFF Standby button. The display should briefly read CLEAR and then the unit switches off. If that clears protect mode, you'll need to redo the Audyssey and configuration setup as these will have been cleared by the reset.
I believe you have a regulation problem ,when you increase the volume the audio output IC draws more current therefore the power supply has to keep up with the increase in current,the symptom might happen if you increase the brighness to the max as well,the voltage changes need to be monitored closely to diagnose what component is not doing the work.If you are familiar with tv service this is a problem that will give you a challenge but if you are not too familiar be safe and let someone else get the headache.Let us know how it goes or if you need more information.