My sony Ericsson W580 phone’s sound won’t work, any help?

I have had a Sony Ericsson W580 for 8 months, and latley the sound will not work.
I can’t hear any music I play, I can’t hear my ringtone, I can’t hear messege alerts, i also can’t hear alarms
my buzz is not on silent
the volume is turned all the way up
and the setting is normal

does anyone know how to fix my problem?

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