My JAP PS2

[zaqxswcde]

OK, i bought a JAP ps2 a while ago with a mod chip already installed. I don't know the version of the ps2 or the mod-chip name. My PS2 automaticly ejects shortly after it is turned on. This is how i play back up games. I put the PS2 utilities disc in and when it ejects i swap it for the burnt game. I have only been able to successfully play backup cd games though and the dvd rips that i have tried don't work. Something to do with the TOB being to large and i don't have a copy of DVD Region X and AR2. My friend has just bought a dvd burner so i was wondering what i should do to remedy the situation so i can play dvd games. Can i work out what mod-chip i have and see if it is up to the job of dvdr playing. Should I try and install a new mod-chip? IS there a chance the my PS2 is too old to play back-up dvds? Any help would be great.

Thanks in advance