muleGot GT4 last night in NZ, had initial issues getting it running, dvd is a gold backed one, clean as a whistle, it kept reverting back to the ps2 main screen. so turned on diagnostics and had little luck. I got it to work finally by once having it in an loaded to reset the ps2 and i got results so that was pleasing.
I noticed in the PAL aus/nz manual for GT4 it says for playstation models ****-30000 and ****-50000 series refer to loading instructions in your playstation 2 manual. I cant be bothered digging mine up but it may lead to resolution or help
my ps2 is a ****-30002 model
I have exactly the same problem, got my copy today. have you had much luck loading it up yet? i have tried tweaking the laser level but am not having much luck with that either. will try some more tomorrow though. i also have a 30002 model, and that set up note in the manual, very intriguing. i cant find my ps2 manual so im not really sure what it is referring to