My lo profile system comes up with no color on a color monitor

[Blacklord]

This is normal for the B500 and B128 as they are 80 column monochrome business machines. But for the P500 this is not, and the most likely cause is the crystal at Y1. Either it is bad or wrong for your country (e.g., NTSC or PAL). Check by using both 5pin and 8pin video cables to eliminate the cables and connector first though. One last check for the P500 is the color trim adjustment R60, remove the metal lid/heat sink for the 6567 and adjust this screw EVER SO SLOWLY and see if that helps. If the problem only happens after the system warms up suspect either the C90, the 2114 color RAM U24, the 6567/6569 at U23, the MC4044 at U21, or 4066 IC at U26.