I have a laptop (dell n5050) the speaker sound is smooth and perfect recently but now, the sound is horrible, it broke and crack when the music tone is high but in low or middle tone it played smooth and good. I test it with a external speaker and there is no problem in the sounds even I put it in a very high volume and played a music which has a very high tone (like rocks songs), I guess the problem was on my internal speaker, any one here could give me an idea, suggestions or recommendations on how to fix this please? my head is blowing up thinking how to fix this. thanks in advance.