Problems with backups on Magic 3.1.....

[m0hx]

I'm having major problems booting my backups on my machine, a 30004R with Magic 3.1... to be more specific, none of my backups are booting...
I'm using Stomp RecordNow MAX 4.5 and a LiteOn DVD+RW LDW401S dvd-recorder... it was cheap, it burns really fast... that's why I bought it...
I followed the guide here howto make ps2-backups using stomp... made most of the backups on a rw-disc, but some on Memorex DVD+R discs...
What is the problem?
Is my chip installed wrong? Or does my machine have problems reading +-dics?