The lamp flashes and lights up and the speaker does not turn on

my speaker working and i turn off in classroom after i turn on and nothing. When it is charging so illuminated for about 5 seconds and then it starts to blink never did it and after the breakdown I did not find any changes in the wires or in the damage. The battery is in place well everything is in its place. I think it's going to be a technical mistake, because it's just like new on the outside and in the inside. So I do not know what's wrong with them and that's why I'm bothering the experts :).