Second monitor only detected after sleep


  1. egotuck
    Posts : 5
    Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
       New #1

    Second monitor only detected after sleep


    Hi all, I'm currently having an odd issue with my (newly acquired) second monitor.

    My primary monitor is connected via DVI and my second is connected via HDMI. Graphics card is Radeon 7700.

    At boot, my machine doesn't detect the second monitor. However, after the computer wakes up from sleep, both monitors are detected and work fine.


    Both monitors ports are a-ok and I've updated all relevant drivers. I'm really not sure what's wrong

    Any advice would be very welcome :)
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  3. Dude
    Posts : 5,915
    Windows 10 Pro X64
       New #2

    egotuck,

    Are you saying during boot up only one monitor shows, then when boot is complete the second monitor appears? Pr are you actually putting the computer to sleep then waking it?
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  4. egotuck
    Posts : 5
    Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
    Thread Starter
       New #3

    Thank you for the response dude. Sorry for not being clear enough (English is not my first language)

    "Are you saying during boot up only one monitor shows, then when boot is complete the second monitor appears? Pr are you actually putting the computer to sleep then waking it?"

    When boot is complete, only the primary appears (my computer doesn't even detect the second monitor). However, after the computer is put into sleep mode and I reactive it, both monitors miraculously work!

    Does that make sense?
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  6. Dude
    Posts : 5,915
    Windows 10 Pro X64
       New #4

    egotuck, yes that sounds strange. Could you update your specs and post a screenshot of you display.

    Go to control panel, click Display, click change display settings, and post a screenshot.

    Are you wanting a dual setup, extended displays?

    Links below for requested info

    Update your Specs
    Post a screenshot
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  7. egotuck
    Posts : 5
    Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
    Thread Starter
       New #5

    Here you go. I am wanting extended displays.
    Attached Thumbnails Attached Thumbnails Second monitor only detected after sleep-untitled.png  
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  8. Dude
    Posts : 5,915
    Windows 10 Pro X64
       New #6

    Which monitor is connected by HDMI, list model.
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  10. egotuck
    Posts : 5
    Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
    Thread Starter
       New #7

    LG Flatron IPS235 is hdmi (the second monitor)
    LG flatron E2251 is DVI (the primary)
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  11. Dude
    Posts : 5,915
    Windows 10 Pro X64
       New #8

    On the LG Flatron IPS235 menu settings, probably buttons on the monitor see if it is set for hdmi or auto, not vga or analog
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  12. egotuck
    Posts : 5
    Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
    Thread Starter
       New #9

    Set to HDMI
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  13. Dude
    Posts : 5,915
    Windows 10 Pro X64
       New #10

    ]I would try to remove catalyst control center, then reboot. When it reboots let windows install the driver. Reboot again. Once here if it works you could try to instal CCC again if you want it, or you could use ATI Tools.

    Found another possible fix

    Look at post number 7
    Last edited by Dude; 21 Apr 2013 at 09:54. Reason: Found another possible fix
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