Many thanks for the info. I will try it our today.
I have tried a few things. Included delete printer driver and re-install it, Reset Printer. Downgrade my MacPro from 10.4.9 to 10.4.8, verifly and repaired profiles with Colorsync Utility. They all didn't help.
I even MSN with Epson UK help desk, they do not have a solution. I would like to ask is anyone using MacPro under OS X 10.4.8 or 10.4.9 have the same problem. To explain it once again, the problem is whatever software I use the printer always print a very very light blue overcast on empty area. I tried it not just with CS2 but also with Word and TextEdit. They all the same, it start printing all over the printed area (less the margine) even if it was a blank page!
Other software I use besides those come with the OS are Photo Mechanic, DXO, Noise Ninja, Microsoft Office and PhotoRescue.
I really do not know how to fix the problem (since I cannot locate the problem).