Help, my QC45 isn't powering on anymore

I bought them two weeks ago, they were fine until Tuesday, when they suddenly stopped working when I disconnected them to find out how to o use multipoint Bluetooth. but it didn't turn on and I thought that the battery died. today I wanted to use it, and i charged it, With the original cable, and another cable. the LED is appearing but I get no response when I turn it on. what can I do?