Thanks for all your help everybody.
I bought a new len for my ps2 and put it in. However, I still have a problem with playing ps2 game (original so you can forget about backup ones) and I can't even play dvd movies (original). Note it does play playstation 1 games and also can run Game Shark.
I tried the link
http://www.ps2newz.net./ where there a FAQ for installing the lens but unfortunately the FAQ link is offline.
I understand that there's 2 things to play with: 1) is the pots and 2) is to play with the height of the len so it's level.
Is there any other thing I need to do beside these these two?
Any instruction would be nice. Maybe another link that you can point me to. Thank you again.
-drtofu