Can't get DisplayPort to DVI working on iMac (same cable works fine on MBP)

Hello all,

Wondering if anybody could give me some advice.

I recently bought a new monitor and cable.

I am trying to output my 27" iMac to the new monitor via a direct DisplayPort to DVI cable (no adapter or anything), and it won't seem to detect the display.

I tried it on the girlfriends MacBook Pro to her monitor and the cable worked perfectly.

The monitor works fine, had it working on D-Sub and HDMI perfectly.

The iMacs DisplayPort works fine also, had this successfully outputting to a TV via D-Sub.

Any ideas?

Many thanks.

Stuart.

Edit: Resetting SMD and PRAM didn't work either.

Which 27" iMac do you have Stuart? The latest 27" iMac for example, has a Thunderbolt output video port which is not going to work with a direct cable connection.

chscag said:

Which 27" iMac do you have Stuart? The latest 27" iMac for example, has a Thunderbolt output video port which is not going to work with a direct cable connection.

Click to expand...

Core i5 late 2009

http://www.everymac.com/systems/app...i5-2.66-27-inch-aluminum-late-2009-specs.html

Just tried it with a dvi to hdmi adapter, works perfectly.

Weird...

Edit: Just tried it with an official Apple adapter to DVI, that works. Must be the cable then.