My tevion 900 mhz speaker does not power on?

I have a pair of 900 mhz tevion speakers and one of them stopped working but it would buzz. I just plugged it into the wall out let and it does not even power on. I plugged a radio into that outlet and that radio does work.

I have not taken the speaker apart or taken the cover off to trouble shoot. what help can you offer.

Thanks.