OS 10.4 - MacBook sound problems...

I'm sorry if this is a re-post. I did a search and did not find anything.

Sometimes my sound "cuts in and out". In iTunes, it will sound almost like a CD skipping, but the music pauses with the sound cutting in and out.

Also, when watching a video on VLC (thats all I use), it will do the same thing, but the video will keep playing. Has anybody had this before? Any input would be great. Thanks!