I have a private game store in my town. The guy in there buys ps2s with the same problems for like 25 bucks and sells them as new. He showed me how theres 2 lasers that read in the ps2s. Sometimes they get dirty and won't play certain games or DVD's (AKA blue disk disease). Most people with this problem either couldn't play blue disks or would only play blue disks (varied). If you got 3 bucks and 20 minutes take your ps2 apart and buy some whip-its (same stuff to clean out computers) and clean out your ps2. 50% of the time this works.