There is more to it than that. If you've flown the 747-400, then you know that the Yaw Damper buttons (left and right) have a round "ON" symbol and then the word INOP can appear on the button with the On indication. When everything is set up right, the INOP disappears leaving the ON symbol illuminitated. But thanks for the feedback. As for the first comment,,,I aggree that if the IRS systems are alligned, then the YAW Dampers should appear on and the INOP symbols should be extenguished. Just now, I was able to get the INOP to go out by turning every thing on the left panel off while engines idle. Then, I powered everything up one piece at the time. When I got to the GEN CONT switches, that's usually when the YAW DAMPER INOP lights pop on. I re-aligned the IRS systems and then powered up everything else and the YAW DAMPER INOP light stayed out. That was good,,,,,and I was able to continue on with the flight. Thanks for any suggestions you guys have.