I have 2 DVI monitors, an HDMI TV, an Apple brand Mini-display port to DVI adapter, and a 3rd party MDPort to HDMI adapter. Only a combination of TWO will work at once: both DVI monitors (one through the MDPort w/adapter), one of the DVI monitors through the MDPort + the HDMI TV, one of the monitors through the DVI port + HDMI TV. The 3rd display is always black. The DVI monitors are indentical-modeled Samsung 22" monitors (not dual link), the TV is 720p. Let me be clear: the 2 displays that do work, work PERFECTLY, whether it be the TV or the Samsung monitor. Even the HDMI audio works absolutely perfectly. I can plug in the 3rd display and that will work perfectly too as long as I unplug one of the others. I read a troubleshooting article whose solution was basically "yeah, don't use 3 monitors, derp"... Not what I bought this machine to do.