I have a DC that I got from a thrift shop for $5 with all of the accessories. The top of the console is severely yellowed similar to a SNES. It boots up and won't read a disc, if I bang on it or tap it sometimes it will read and play for a period of time but may reset. I don't think it's a power issue and I've checked both motors and they move the laser and spin the disc. I've also cleaned the lens, is there a way to calibrate the laser or adjust it to see if its out of alignment?