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.
SCPH-10000 S. MINOKAMO v1.01 (Defunct)
SCPH-10000 S. KISARAZU v1.00 (faulty)
SCPH-15000 S. KOHDA (With warranty seal!) :D
DESR-5100 S. EMCS