I have 2 model 2 playstations, and some games I've played on both make both machines run loudly.
These are all early titles and have a blue tint on their bottom side, but not as thick as the old black PS1 titles. ( 2 EA titles, and a 3DO ).
Most of my titles look like normal DVD's but these don't.
I don't suspect they're bootlegs, I was curious if I should simply deal with the noise, discontinue playing them, or if anyone else has had the same situation?