Copy works in emulator not in psx, help?

[DEatHbUrn]

Is it possible for copies of psx games to work in an emulator but not in the psx. I made a copy of madden 2003, the cd copy works with ePSXe emulator, but not im my psx.
Yes, I have a mod chip installed, have made other copies of games and they work, but for some reason madden wont get past the initial white screen with the sony logo.

-other info
I'm using the same media, burner, and burn speed as other copies I made.

Hell, I managed to burn a copy of a game once at 16x, so dont even think that burn speed is the reason.

Any help would be appreciated.

Thank You.