Question Greetings, I am an old (very) newbie and hope that I am posting this in the corect area?

Feb 17, 2023
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I rescued a semi-drowned JBL Flip 5 in August last year, dried it and eventually got it working quite successfully until a couple of weeks ago. After a couple of hours listening to it while we had a power cut, again, (hooray Eskom) I turned off my Flip. Next day, when we had yet another power cut I tried to turn on my Flip but could not. After doing some research I found that I could start it by conncecting to an external power source. I have tried all manner of button combinations to do a factory re-set and to disable 'Service' settings, all to no avail. I still have to conncect to an external power source in order to start it, thereafter it works normally. Does anyone have any suggsetions to get around this problem? Regards Careybird