Intermittent Sound Problems

I am having problems with sound dying on my front speakers on my iMac. Sometimes no sound on front speakers but all three headphone jacks work. Sound goes dead from front speakers on awake from sleep and sometimes after restart (no bong). Headphone jacks allways have signal when I check. Sometimes sound comes back after brief crackle!
Have tried usual dodges of working speaker jack into ports to check for bad cutoff connection etc. Don't really want to crack case but.......
Any help or advice greatfully recieved.
G3 iMac DV SE 600MHz Mac OS X (10.4.3)

I would first try Resetting the pram. However, because you are running OS X on your mac be sure to have upgraded the iMac's firmware first. if you don't have the latest iMac firmware upgrade and you reset the pram you could lose your video.
http://docs.info.apple.com/article.html?artnum=75130

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This question was solved.
View Solution.

Quick and easy fix is to buy a cheap USB sound card (it resembles a flash drive). Just do a google search and you should find one for $2 to $3.
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Quick and easy fix is to buy a cheap USB sound card (it resembles a flash drive). Just do a google search and you should find one for $2 to $3.
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