Pre Chipped PS2 Media Problem

[TB-303]

I've purchased a pre chipped UK v7 ( SCPH-39003 ) with m2pro, from a respectable person here.

I am having problems getting the PS2's DVD-R Backup's working!!

I've tried the following brands:
"Unbranded x4 Ritek G04" and "ICE White" PS2 DVD-R backups burnt with Pioneer A05 @ x1.

Both brands fail to work in this machine, keep getting the red "please insert disk " screen.

PS1 Backups - Success ( Not All work )
DVD Film/Movie Back-up - Success On unbranded Ritek G04's!!!

PS2 Originals - Work Ok, although i had a problem with " This is Football 2003 " When it tried to load the actual match it just freezed on "loading"

Any ideas??

TB