Can't play backup with Jap PS2

[Uranus1]

Hi, I downloaded Crash Bandicoot, ICO, and Batman from IRC and burned them on CD with no problem. But when I tried to boot them up with the swap trick on my Jap PS2 (model 10000), all I get is a black screen. I know for certain that my PS2 can boot backup because I do it for all the Japanese backups with no problem.

Are these files from IRC soley for the US PS2? Or is there something that I'm missing?

Thanx