Hi, I know it is an old post and it is how long my PS2 is sitting in my room as a decoration item. Recently I found a great solution for the dis read errors and now my PS2 is working again. It seems that all you have to do is clean the laser lens very carefully and it should solve the problem.
Here is the page where I found the solution
PS2 Repair It is a tech support site that provide step by step information and photos.
Good luck
Joe