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My JBL speaker sometimes made noises when the speaker was powered on, but with nothing being played. So I remembered a device I bought for my car when I was playing audiobooks thru the speaker system using a plug in the glove box. It is called a ‘Ground Loop Isolator’ (mine is made by Pyle) and when I plugged it into the JBL speaker input, then plugged the device into the computer, the noise disappeared. Got it on Amazon and it now costs $12.79 (October 2020).
Thanks. Finally I got my frozen phone to shut down. Instructions on another site didn’t say to press and release the volume up then down buttons quickly, then the sleep/awake button. That seemed to make all the difference.
