What should I do if the PartyBox 310 speaker won't turn on?
Ensure that the speaker battery is not drained; if it is, connect AC power instead of relying on the built-in battery. Check that the power cord is properly connected to the AC power supply. Use only the provided power cords when connecting to AC power. (Page 16)
From the official Jbl Partybox 310mc Portable Party Speaker manual, page 16
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