PS2 Loading & Playing

The machine powers up and gets to the browser screen fine, i can navigate the browser and settings. when i insert a PS2 or PS1 game or a DVD, it says "Reading Disc" for a significant amount of time (upwards of 10-15 seconds) then displays "Can Not Read Disc". BUT, it plays Metal Gear Solid 2 just fine. It reads some other DVDs and games, and displays them in the browser, but when i select them they do not load. Also, some discs make loud clicking sounds when the machine is reading.

I tried cleaning the lens with a cleaning disc, which solved the problem for a few days, but it came back and the cleaning disc is no longer effective. I opened the case and cleaned out a large amount of dust, but it still does not work properly.

What solutions are available, and if my PS2 is not fixable, at least why does it only play the one game?

Thank You,
nwvtskiboy