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My desktop computer has a double monitor. Last night, I was experimenting on a monitor cable and replaced the one with the digital display without turning it off. When I have connected the cable, the monitor won't work anymore and it keeps on going to sleep mode as if the computer is off. The computer seems not to recognize the monitor any longer and when I go to Drivers at the Control Panel, it only shows me single display. What do I need to do? Thanks.

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  • Manny Aquino Sep 04, 2010

    If I use the vga connector on the dead monitor, it works. It is when I switch it to digital that it does not respond.

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  • 4,737 Answers

What if you only connect the non-working monitor after disconnecting the other?

I would suspect the Video card, if both the monitors have similar connectors, eg DVI/HDMI, the first connect the dead monitor on the working port or vice versa. That'll reveal the truth. If it's working, then the problem is with your Graphics card, you'll need to replace it.

If it's not working then, hook it up on another computer. I hope it has multiple ports, if so switch the ports, suppose if you are connecting it through the DVI port then try VGA or HDMI or the other way.

(First of all, try to find out the culprit and start troubleshooting)
Let me know if you need further help.

Good luck.


Thanks for using FixYa.

Posted on Sep 04, 2010

  • Lebanon Raingam
    Lebanon Raingam Sep 04, 2010

    One more question, does the other monitor has digital port on it? If so give it a try.




    To troubleshoot this issue properly, you'll need another cable (spare), so please keep it ready and try with both the monitors on the DVI port.


    Good luck.

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