iMac, ATI Radeon 2600 pro card - no video out

[Zoben]

I have an iMac with an ATI Radeon HD 2600 Pro graphics card, and I cannot get video out of the Mini DVI connector on the back. Looking on the stuff below from the "about this Mac" menu, I see that for the ATI card, it says "Mirror: Off" which I think is the problem. How do I turn the video on?

Thanks -

iMac:

Model Name: iMac
Model Identifier: iMac7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 4 GB
Bus Speed: 800 MHz
Boot ROM Version: IM71.007A.B03
SMC Version (system): 1.20f4

ATI Radeon HD 2600 Pro:

Chipset Model: ATI,RadeonHD2600
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: ATI (0x1002)
Device ID: 0x9583
Revision ID: 0x0000
ROM Revision: 113-B2250F-212
EFI Driver Version: 01.00.212
Displays: iMac:
Resolution: 1680 x 1050
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
Display Connector:
Status: No Display Connected

 

[Intell]

Display Connector:
Status: No Display Connected

This is your problem. It doesn't see anything connected to the video out port. You need to connect something to the adapter before it will do anything. If you're still having problems, restart the iMac with the external display connected and powered on.

 

[Zoben]

Hi - thanks for your reply. I tried this and still got "no display connected". I have a Dynex Mini DVI - to - composite converter, with composite going directly to the TV. I wonder if the fact that it is not an Apple converter makes a difference? I have verified that the composite cable is good, and that the TV responds to composite input.

 

[Intell]

Only the Apple branded ones work for the TV out. But generic ones work for VGA and DVI out.