ps2 Apple Mod chip does not play dvd-r backups

[rionroc]

help, my Playstation 2 scph-39006 with Apple Mod chip does not play dvd-r backups...

it can play cdr backups though, like AR max and ps1 games.

already tried:

•Press EJECT button to switch on the machine.
•Insert PS2 game in tray, then press EJECT button to close tray.
•Once the tray closes fully, press/tap the RESET button once to load game

- factoids ps2 boot procedures

and I am certain my unit has a modchip.

I have used Nero, Alcohol, and DVD Decrypter but no luck.