Tracking down video problems

Discussion in 'Mac Pro' started by Phillie14586, Apr 26, 2011.

  1. Phillie14586 macrumors member

    Joined:
    Oct 14, 2010
    #1
    I have a mid 2010 MacPro that has had some video problems ever since I got it. I am trying to determine if it is a cable problem or some problem with the video card. I have a monitor connected via the DVI port and this has no problems. I have my TV connected via a minidisplayport with a MDP to HDMI adapter to HDMI cat 5 extender. This is what is giving me problems. Swapping out all this will cost over $100 so I would like to confirm that it is not a hardware issue with the computer if possible.

    I run the TV as a second monitor ans when I first set it up at the beginning of the year it would intermittently not detect the TV. I fiddled with things and removed some HTPC programs that were throwing a lot of things to the console logs. I finally got it working just fine for about 2 months. Now all of a sudden it will not always detect the TV. What I need to do to get it working again is to unplug the MDP plug and wait about 15-20 seconds then carefully plug it back in. It may take several times but eventually it will work. Just fiddling with the cables does nothing. There are times I get video but either no audio or audio with a lot of electronic distortion. The only way to fix this is to restart the computer. I am using XBMC as my HTPC software. What is new now is when I am watching a recording the video will go black and the audio will stop for 15-30 sec then the video comes back but no audio for another 15-20 seconds. I can rewind the recording to before it happened and watch with no problem through that section so i don't think it is a corrupted file.

    I have looked through console logs but I have no idea what I am looking for if there is a hardware issue. Any thoughts on how to determine if it is a video card issue before I start changing all the wires to the TV? One though I did have was to get a MDP to DVI adapter and connect my monitor to the other MDP port. If it is a MDP port problem then is should happen with both the monitor and the TV.
     
  2. Transporteur macrumors 68030

    Joined:
    Nov 30, 2008
    Location:
    UK
    #2
    What happens if you connect the TV directly via miniDP - HDMI adapter without the CAT5 extender?

    Considering that a lot of people run that kind of setup without problems, my bet is that the extender is the source of your problems.
     
  3. Phillie14586 thread starter macrumors member

    Joined:
    Oct 14, 2010
    #3
    The problem has now become constant so I moved my computer next to the TV and connected with a MDP to HDMI adapter and tried two different HDMI cables. When I switch the TV to the input I have connected the computer to it says "Retrieving Data" then says "No Signal" When I choose an unused input all I get is "No Signal." I then moved the computer back to the desk and reconnected everything. Since I have the computer set up as an extended desktop between the TV and the desk monitor and I had just connected the computer to only the TV it thought the TV connection was the main monitor and the desk monitor was the secondary. So I turned the TV back on to see if it was getting a signal and it was not. So I unplugged the MDP and I got the desktop back on my monitor. But if I go to system preferences and select Monitors it only sees the desk monitor.

    My plan from here is to get another MDP-HDMI adapter and a MDP-DVI adapter. This way and I can swap the adapter going to the TV to see it it is the problem and I can connect my desk monitor to the computer using an MDP. Anyone have any other suggestions?
     

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