I have a Mac Pro setup that was running 4 DVI displays using thunderbolt to DVI adapters. We decided to replace the DVI displays and upgrade to four 1080p LCD TVs using thunderbolt to HDMI adapters. With this setup, the Mac Pro will only recognize one display at a time and I'm not sure why. If I try plugging one display directly into the HDMI port and another into a thunderbolt port, it will only detect the one inserted into the HDMI port. Anyone know what could be happening?