My PS2 still won't read CD-R backups...

[Jinomen]

I successfully got my V4 PS2 modded a few days ago, and it works fine. One problem, though. I got a Madden 2003 burned on DVD-R, and it loads. Well, I burned Virtua Fighter 4: Evolution on a Verbatim CD-R...and it doesn't load. The PS2 recognizes the game, and when I go to the browser screen, the blue disc icon comes up. I select it, wait a few seconds, and it takes me back to the same browser screen.

Is it just my laser? Cause I've heard reports of V4 PS2s having bad lasers. Also, I can play all my other CD and DVD based games.