I found an original big ps2 at a thrift store Today, I got the system along with a controller. The disk drive tray kind of groans when opening but otherwise seems to work fine. It wont play any of my ps2 games though however. It plays dvd's and some of my ps1 games fine, but if i put in a ps2 game It just times out and says its an invalid disk. What could cause this / what can i do to fix it? Any suggestions or help is appreciated.