I have a new Inspiron 3252 an older Harman Kardon HK595 speaker system. On the back of the pc the jacks are, pink (mic), green, and blue. The three wire cable coming from the speaker system (sub-woofer) are, black, green, yellow. I have no idea how to hook them up so they work. I just get a loud squeal out of the speakers. I would think there's an easy fix for this. If not, do I have to buy a new speaker system?