No sound. Hiya, i have an e system 3086 and now all of a sudden i have no sound. The system won't

Question

Hiya, i have an e system 3086 and now all of a sudden i have no sound. The system won't play internal sounds like low battery, windows start up music,no sound in media player etc. It is a re urb and i've had it about a month. I have checked the speakers/settings and it tell me that everything is working fine. My desk top speakers and woofa still work.... Have u any ideas plz?