I've got a question along these same lines. I have a 2009 Mac Pro with the NVIDIA GeForce GT 120. I have an Apple Cinema Display via the Mini Display Port.
I recently bought an ASUS MS238H to use a second monitor. It has VGA and HDMI inputs and came with DVI-VGA and DVI-HDMI cables.

Using the DVI-HDMI cable, the MAc never sees the monitor and the monitor immediately goes into power save mode. Using the DVI-VGA able works -- the max sees it, let's me set it's resolution. It works fine, but it's VGA.

What would I need to do to get the Mac to see the monitor via the HDMI cable?

My suspicion is that the HDMI input on the Asus monitor is dead. Do you have something else that outputs HDMI that you can attach to the display to test this theory?

Trevor

My first thought too -- yes other devices, a DVD player, for instance, do work with the HDMI input on the ASUS.

There are many forms of DVI and i suspect that the cable you have been given might not be compatible. http://www.playtool.com/pages/dvicompat/dvi.html

As such your card has a dual link DVI port.
I think you need a dual link DVI-D to HDMI converter and use an HDMI cable.
http://www.sourcinggate.com/hdtv-dvi...da-p-6190.html
Dont get suckered into paying load sof money for your cable makes no difference IMHO.

Thanks for helping me through this.

My cable was _not_ dual link cable, but I did have a dual-link DVI -to- HDMI cable on order. It came today.

No joy.

Any other thoughts?

Thanks!

Followup:

I bought a Belkin DVI-to-HDMI cable at the Apple store and it works. Yeah! No idea why -- it looks identical to the cable that came with the monitor.

sweet....have had many odd issues as well in the past with DVI / Cables /adapters / HDTV settings etc but all good it is working !

Sweet indeed. Thanks for the help!