Hi,
We just had our first outing last weekend in our new 2720. I had the same exact problem with our radio. It wouldn't turn off by pressing and holding the SOUCRE/POWER button as the instructions indicate. I was determined to figure this out, and while mine was displaying "ADJUST" I pressed the Display button, and "magically" it shut off. After that, pressing the source/power button worked to turn it off and on. Good luck!
Steve
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