DMS3 V9 prob

What would cause a DMS3 V9 to just stop booting backups at all, but let originals continue to work, quick boot mode (for one of the kids i did an install for thats having a small problem) stays on a black screen when a game is in the drive, im just guessing hes doing something wrong.

Would the CD/DVD Wiring do this or would the BIOS wiring do this?

When a backup game boots, does it go to a black screen or does the PS2 just not read it?
I'd say look at the CDVD Wiring..

just RSODs but im sure its the CD/DVD Wiring

Yeah, it's most likely that..
Though once you get the PS2, test out some PSX backups and give some results..