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Dual display with HDMI + DVI connections not working correctly.

There was a power outage on Friday (9/06) while my desktop was in sleep and caused me some problems at first. The computer did not boot up to show a display on either my TV or main monitor. After following the guide I found on Tomshardware, it appeared that resetting the CMOS battery on the Gigabyte GA-Z87x motherboard, the displays were back in working order.

I have used the computer for the past two days with no problem. However, I awake this morning to start my computer, and only my TV (which is connected through an RGB to DVI connection) is displaying. I tried restarting my computer, which did not seem to make the main monitor (on a HDMI connection) start up. I tried disconnecting the DVI connection to force the computer to recognize the HDMI connection but to no avail. I'm running with a NVDIA GeForce GTX 770 video card. Any tips on troubleshooting the problem? I think these problems all stem back to the power outage on Friday.
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  1. Best answer
    Have you checked to see that those two monitors are actually in working order? tried plugging it in one at a time? Or a driver reinstall.
  2. dreamerz said:
    Have you checked to see that those two monitors are actually in working order? tried plugging it in one at a time? Or a driver reinstall.

    I'm using the computer right now, and the LCD TV is working fine (the monitor connected to the DVI connection). I did try starting the computer back up with only the LED monitor hooked up to the HDMI port, and it did not recognize the monitor (monitor's in perpetual standby mode). I want to say that both monitors are in working order as I was using both last night.

    When you suggest driver reinstall, do you mean for the video card? I feel like this could be a vid card problem.
  3. Yes, the video card drivers. Have you checked the nvidia control panel to make sure multimonitor is still setup?
  4. dreamerz said:
    Yes, the video card drivers. Have you checked the nvidia control panel to make sure multimonitor is still setup?


    Fixed it! It was a faulty HDMI cable connected to the LED. Thanks for the help! My process:

    I tried to isolate the problem and removed the video card. I then plugged the DVI cable into the motherboard for the TV and it worked OK. Then I disconnected it and plugged the HDMI into the motherboard, but the LED didn't display. I then used a spare VGA cable and connected the LED to the motherboard, and sure enough LED lit up. I switched out the HDMI cord and it worked like a charm.

    I'm happy it was just a simple cable problem, but that's usually not what I figure to be faulty.
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