Messiah2 + PS2 v7 = non-running backups
 

A backup of a PS1 game that I tried worked fine, and all my originals work okay.. but a backup of a PS2 disc, made onna DVD+R, gave me a red screen.

Starting with the easiest to fix, what are the possible problems its having?

You have some wires crossed in the installation. Does your system read the original DVd also?