Hello All. I have a Powermac11,2 with the 6600LE video card, 10.5.8, recent software updates. I have been using two displays for some time now with no problems whatsoever. I recently replaced one of the monitors with a higher resolution unit and now, if I boot my machine up with both monitors connected, this happens: I had an Acer 21.5" 1080P monitor and Hanns-G monitor which ran at 1440x900, IIRC. I replaced the Hanns-G with a Samsung 2333T, and I'm now using the 2333T as the main display. So now I have two 1920x1080 displays. Turning off the secondary monitor does not fix the problem. Unplugging it doesn't either. However, if I boot the machine with the secondary DVI cable unplugged and plug it in once the system is up and running, I don't have the problem. Likewise, once the system is up and running as pictured above, I can unplug a DVI cable and plug it back in, and the system appears to reinitialize the display and everything is back to normal. Thanks in advance for your thoughts.