I just searched Apple and found LCD Displays: About Pixel Anomalies Article ID: 114113 and it says "....Occasionally, a transistor does not work perfectly, which may result in the affected subpixel being turned on (bright) or turned off (dark). With the millions of subpixels on a display, it is quite possible to have a low number of faulty transistors on an LCD. " It says to call Apple but does not imply this is something that can be repaired. I need to withdraw this topic from the list as it is not really a G4 issue. It is an LCD display issue. If you have some info or know someone that rapaires LCD's, please just email me.