Speakers panned right on start-up

every time power on or restart computer have re-center panning of speakers under system settings. panned right on start-up.

i'm on built in speakers.
10.6.8

want stop happening, advice please.

 

reset pram.

shut down.

press power button , hold command+option+p+r

hold these keys until second "gong" sound.

done.

 

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