Help: Screen Size Issues

[clumzy]

Hi there, hoping that some ps2 gurus may have seen this problem before.

I have a ps2 and magic3.1 installed, works fine. I recently got a receiver with digital optical in so I was playing around with some DVD movies in the ps2 and fiddled with the 16:9 screen sizes.

Long story short, when I boot up the ps2 now on the BIOS screen there's a black border all the way around the screen. When I play games the black border is still all the way around, kinda like the picture is too small for the TV. But when I play a movie there's no border all the way around.

Anyone ever see this before?? It's really aggrivating ... is there a way to reset the BIOS to factory defaults? I've tried going into the BIOS setup and selecting 4:3, FULL and 16:9 with the same problem.