iMac, ATI Radeon 2600 pro card - no video out

Discussion in 'Mac Accessories' started by Zoben, Dec 15, 2011.

  1. Zoben macrumors newbie

    Dec 15, 2011
    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 -


    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
  2. Intell macrumors P6


    Jan 24, 2010
    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.
  3. Zoben thread starter macrumors newbie

    Dec 15, 2011
    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.
  4. Intell macrumors P6


    Jan 24, 2010
    Only the Apple branded ones work for the TV out. But generic ones work for VGA and DVI out.

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