No sound when i plug in my headset HELP! ALSO BB TURNS ON AND OFF

example i can only play music on speaker phone but when i try to use headset it does not play nothing no sound at all i have tried so many headphones so my headphones is not the problem
 ALSO
my blackberry decides when it wants to be off and when it wants to be on the srceeen just disappear and the blackberry dont turn on until sometimes a day or two HELP !!!!!!!!!!??????

You're selecting the Output tab in System Preferrences > Sound  then selecting the correct device?
And check out this thread >  which headphones are compatible with...: Apple Support Communities

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