5770 with 27" Apple LED and two 20" Apple Cinema Displays w/Mac Pro

Question

As stated, I just bought a brand new Mac Pro 8-core (2010 ID 5,1) with a 5770 card and I'm trying to hook up a new 27" Apple LED and two 20" cinema displays. One of the 20" monitors is using the MDP adapter into the 5770 and the 27" is directly connected to the other MDP port. When I try to hook up the other 20" to the DVI port on the 5770 I get nothing. The screen is black and the it is not recognized as being connected. I'm using the standard DVI connector that came with the 20" direct into the 5770. To make sure it isn't a monitor problem, I switched out the 20" displays and both work using the MDP adapter but neither work plugging directly into the DVI port on the 5770. I believe the 20" monitors use DVI-D. (Is that correct?) So what's the scoop on getting blank screens when plugging into the DVI port on the 5770? Thanks for any help.

Answer 1

"• the 27" is directly connected to the other MDP port.
• One of the 20" monitors is using the MDP adapter into the 5770.
• When I try to hook up the other 20" to the DVI port on the 5770 I get nothing.
Note: If you are using an Apple Mini DisplayPort to DVI adapter, only two displays are supported across the three ports.
If you are connecting three displays, any DVI displays must be connected to either the Dual-Link DVI port or must use an Apple Mini DisplayPort to Dual-Link Adapter.
You MUST use All "Active" or "Powered" Mini DisplayPort connector such as the Apple Dual Link, or you can only use two displays