Sound and CPU problems

Okay here are my symptoms. I'm not sure if they are related or not but any insight is a plus.
A month ago approximately 98% of all sound went out on my Powerbook G4 17". I get a red light from my headphone jack and the sound output says digital when there is no digital device that it's supposed to be connecting too. The reason why I say 98% is because I can put headphones in a maybe 5% of the time the headphones will kick in for about 3 seconds then cut back to digital and the internal speakers will kick on randomly for a few seconds then kick back to digital, accompanied by a total loss of volume control. Additionally, some of the time it wont say digital out when I can't get any sound, it will say internal device (spdf). I've restarted, resets, everything most forums suggest. Now my second symptom that seems to have arrived at the same time is randomly, maybe four or five times a day, my cpu user usage will jump to 100% and completely bog my comp. My assumption is the logic board is on its way out but I'm not sure. What are the signs of a bad logic board? Thanks

Hi all.
Here is the back round on my situation....
I have been poking around this forum for the better part of an hour. Either I'm not seeing right bc its late or no one has the same issue. I also cannot find where to post a new topic so this was just on the same level.
My brother has an old powerbook 17" that has some problems. All can be resolved with some parts that I know are bad and either have or can get to replace. My road block is the sound.
I have no real way of testing this thing. Its been dropped a bunch. Apple replaced it all once. Then dropped again out of applecare. Then I dropped it and the sound just quit. At first it was just the internal speakers then over time so did the head phone jack. No software reinstalls helped this. Shortly after he dropped it and the screen shattered and the hd went.
I have an extra hd bc I upgraded mine. found a screen $270. But there is no use repairing it if the sound doesnt work. 90% of what he would use it for is to record his music and such (he uses mine all time, hence why I want to fix his haha).
I do not know what hardware needs to be replaced to fix this problem. I have spent all night looking it up and I am no where. Only other part I find to replace is the logic board. This is about 450$ and would upgrade his chipset. All I know about the logic board is that it has the processor on it.
My question is
What hardware has the sound card on it or controls the sound so that I can replace this card, chip or board. Any help would be great.
Thank you

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