Powerbook G4 Right Speaker Not Working

Hello, i just recently purchased a very gently used Powerbook G4 15 inch, 1.67 Ghz, 2GB Ram, 80GB HDD, OS X 10.4.11. the computer performs phenomenally and overall feels like a brand new computer! 😍 however, the right speaker is not working. 😢 i understand this is the model with three speakers, left - middle (more proximal to the left speaker) - and right. when i try to slide the volume slider to the left the left most speaker makes sound, when i slide the volume slider to the right, the middle speaker only makes sound. im wondering if the powerbook is mistaking the middle speaker as the right speaker because it only shows two channels - 1 for left and 2 for right - but the "2" is only playing though the middle speaker. i hope theres an easy fix, something thats not hardware related. if it cant be easily fixed then it doesnt hurt me too much because the computer was only 50$ 😎