i couldnt tell you. when is a yellow light supposed to light up? you see im color blind and i cant really tell the difference between yellow/red/green.
also it still plays dvds and cds, but im pretty sure i have the kem 400 aaa lens with only one lens. ive taken the cover off of the blu ray drive and watched it read until it fails, and i can see the laser and then the little disc shows up in the corner. then i can see the laser go from focused to broad like the software is telling it to try and find the disc or read the disc, and then the laser disapears.