It's probably your TV being unable to display images with the PAL signal type.
I have a fat ps2 50001/n and have a couple of pal games that i loaded onto the ide hdd. when i play them i get the rolling screen and black and white color issues.
If that's the case, and you don't want to replace your TV, then you may want to try using GSM to force the signal to be NTSC.
Unmodified SCPH-77006 with SM 3.6
SCPH-39006 with M-chip modchip, SCPH-10281 NA and refurb Seagate 80GB HDD
SCPH-10000 v1.00 with SCPH-10190 PCMCIA NA and SCPH-20400 HDD unit