Ok, the same thing happened to me edczxcvbnm, I do recommend taking your PS2 apart. If you are getting DRE's. All you need to do is take the cover off then the cover protecting where the discs go in, open the tray and turn your PS2 off, behind the Disc tray is a white dial, turn it clockwise 2 clicks and check to see if your games are working then. They should all be working fine after that.
My PS2 was making all these clicking noises and I was getting DRE's alot, now it works better than I first got it.
http://www.gamingworldx.com/features...airGuide.shtml
This guide explains it in full.
I really hate Sony for making shoddy lasers, seriously. I loce them and hate them, its so odd.