Ok I have had this problem with two ue megabooms now. The first one I sent back to Logitech and they sent me a new one. The second time I did not want to wait on Logitech so I did some research and solved it myself in a very strange way. On another forum someone said to press the volume up button all the way and that worked. So bear with me and I will explain it the best way I can. With the speaker plugged in, on, connected to a phone and playing music, pause the music(so you don’t blow the speaker or your own ears), then hold the volume up on the speaker until it starts making the limit noise. Keep holding the up button and unplug the speaker. Lower volume on phone and then click play and speaker should be working.