Sound goes off in OSX

Hay every one, My problem is When I load the program (e.g Jump Start Toddler for my kids) in classic mode on my Macintosh with OS 10.4, the sound is always muted. When I unmute it and go back to the program, it is always muted again. please guide me through to some procedure.
Thanks.

Internal speakers....I'm out of the warranty period. I think I've identified the root of the problem...seems to be with clips whose audio is of a low sample rate...I rexported the clips from Mpeg Streamclip at 44.1 and it's ok now...unless that was a coincidence.

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