My IBM T21 was running well until the LCD cable went bad, indicated by the backlight going out. I replaced it, but I was given a new type of cable. The FRU 27L0519 has been replaced by the FRU 27L0640, and should be compatible, according to ebay stores and IBM themselves. However, after installing the cable, all colors are inverted on the screen, and there is a noticable flicker associated with it. Why is this happeneing? Is there an easy fix? Can anyone help?