I have recently purchased the boeing 737-800/900 series and I am being faced with one major problem. I can't get the autopilot to engage. I have run through the overhead panel startup, programmed the FMC, done everything that I could think of, but when I go to engage the autopilot, the two little lights don't light up, and none of the autopilots/autothrottles start to work. What is it that i'm doing wrong?All feedback is much appreciated!Spiritwo