It appears we can get the Z5 to respond to the power off, but not the power on. This seems strange to me since it is the same code, just hit twice to turn the unit off. I am wondering if maybe this particular one requires a longer pulse for power on. Is there a way to increase the duration of the IR code on the MX-900, or am I completely off track? Thanks for any input. This is all we lack in getting this project complete.