Hi folks, I have the Mac Pro in my signature running my HP ZR2440w monitor on a ATI Radeon HD 5870 via DVI port. I wanted to connect my second ZR2440w monitor via the mini-display port cable but the OS doesn't detect it. Tried power cycling the monitor and unplugging the cable but nothing worked. I'm running OS X 10.6.8. Anyone knows if there's a known errata for this? Thanks!