alright, I have a JVC KD-SX840 CD player in my car. It plays normal cd's fine. But, when it comes to CD-R's its EXTREMELY picky. They must be burnt on either blue (TDK or Verbatim) or gold (PNY) cd-r's or it will not work. Also, I havent tried this yet, but I'm thinking the burn speed has to be extremely slow. cause when i burnt a cd at 40x, the car didnt want to play it, then it did, and now it no longer plays it anymore. I have no idea whats going on but if anyone know's what the problem is or if there's any solution to fixing it I'd really appreciate it. I dont want to have to buy another HU but if this keeps being a ***** I'm gonna have to. Thanks.