Thanks. I've had the system for a year and a half so I figured the warranty was already gone. I opened the system and cleaned it and now it plays DVD games. I read the FAQ on adjusting the voltage, and it made me a little nervous. I haven't called Sony, yet. I will probably look at that guide again about adjusting the voltage. If I don't think I can do it, I'll call Sony and see what they say.
My wife is ticked off because she bought The Sims for PS2 and can't play it because it is a CD based game.