Help, problem with backups and new ps2.

[VeenarM]

Hey, i just purchased a pre-modded ps2.
i dont know what the chip it has in it but the model and V is
SCPH 30002 R
V5/V6

It plays all ps2 games perfectly.
but my backups dont work, i am doing the burning and everything all right i just dont know whats going on.
Using Princo A Grade -R
i heard they are bad but i dont think so bad they wouldnt even read?
The first back up of tekken 4 worked fine, and it runs but other games soul calibre 2 doesnt, or it loads then freezes and sits there.

Also the ps2 doesnt even run DVD Movies
just wont read any movies at all.
pls help goin threw cds here :-
also do +RW or +R work ?
Thanks any help be greatly appreciated