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  1. #1
    Hooking up an external monitor

    Member Since
    Dec 27, 2006
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    New York
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    Imac 21.5 and MBP
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    Hooking up an external monitor
    Hi all,
    I have a 21.5 iMac running Mojave. I am trying to hook up an external monitor to this iMac. It's an ASUS monitor, probably 6 years old or so.
    I have tried a HDMI cable to a USB-c. I then went into display. Hit the option key to "Detect" and nothing is found. So then I bought a VGA adapter to USB-C and still nothing. Could it be the monitor is too old? I can't believe I'm having so much trouble trying to set up an external monitor. Any suggestions? Thank you

  2. #2
    Hooking up an external monitor
    pigoo3's Avatar
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    May 20, 2008
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    2011 17" MBP 2.2ghz, 16gig ram, OS 10.11.6
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    Hey there frostygirl thanks for stopping by.

    Please verify for us the following:

    - Exactly what model iMac it is (there are lots of 21.5" iMac's).
    - What ports does the Asus monitor have.

    Knowing this info...we can suggest what adapters and/or cables you will need.

    HTH,

    - Nick

    p.s. Normally you should only need to plug everything in...and all should work. Have you tried rebooting the computer after connecting everything?
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  3. #3
    Hooking up an external monitor

    Member Since
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    IMG_1103.jpgIMG_1165.jpg

    Hi, its a 21.5 , 2107 iMac Retina 4K, 3 Ghz Intel core I5,Memory 8 GB 2400 Mhz DDR4, Graphis Radeon Pro 555 2 GB, 1 TB HD. The Asus monitor picture and the iMac picture is attached. Thank you

  4. #4
    Hooking up an external monitor
    Slydude's Avatar
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    Nov 16, 2009
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    This should be pretty easy. I've connected monitors older than that to iMacs. If I had to choose I'd choose DVI over VGA. A cable such as the one should get the job done. It's a Thunderbolt to DVI cable. Some manufacturers refer to this as a Mini DisplayPort cable.
    “Hard work beats talent when talent fails to work hard.”
    Kevin Durant

  5. #5
    Hooking up an external monitor
    pm-r's Avatar
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    Hi, its a 21.5 , 2107 iMac Retina 4K,...

    Hmmm..., maybe that 2107 iMac is just too far advanced!!!

    On a serious note, does the ASUS monitor have an option to choose and select what input Port is being used with what looks like a DVI connector connected???



    - Patrick
    ======

  6. #6
    Hooking up an external monitor

    Member Since
    Dec 27, 2006
    Location
    New York
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    Your Mac's Specs
    Imac 21.5 and MBP
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    sorry about the typo. the Asus monitor does have an option. I choose VGA when I try it with the VGA plug and HDMI with the HDMI plug. Those are the only two ones I have. I also purchased these (attached). Did I need to purchase a DVI adapter or just get a whole new monitor? ThanksIMG_1169.jpg

  7. #7
    Hooking up an external monitor
    pigoo3's Avatar
    Member Since
    May 20, 2008
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    Your Mac's Specs
    2011 17" MBP 2.2ghz, 16gig ram, OS 10.11.6
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    Personally I would stay away from VGA...I would try DVI before giving up.

    - Nick

    p.s. You didn't verify if you tried rebooting the computer after hooking everything up.
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  8. #8
    Hooking up an external monitor
    pm-r's Avatar
    Member Since
    Oct 16, 2010
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    Maybe have a look at some of the google hits here and you may want to modify the search for the particular Model:
    Asus monitor inputs Mac - Google Search

    Asus monitor inputs - Google Search

    it seems that a restart of the monitor maybe needed as I glanced through the hits.

    EDIT:
    And how about this:
    Switch ASUS Monitor Input from HDMI to DVI
    Tags: hardware, monitor, asus

    Tuesday, June 28, 2016 4:24:45 AM
    Situation: We have an ASUS VS238 monitor that can can DVI, HDMI, and VGA inputs. We're wanting to switch from HDMI to either VGA or DVI input.

    Problem: We unplugged the HDMI and plugged in the DVI cable and receive this message: HDMI No Signal.

    Solution:

    Turn off the monitor.
    Turn the monitor on.
    When "HDMI No Signal" appears, press the Input Select Button until you've switched to DVI.
    Muddling Thru - Switch ASUS Monitor Input from HDMI to DVI

    Hmmm... a press and hold trick to get the switch to take.it looks like. That's sneaky.



    - Patrick
    ======
    Last edited by pm-r; 11-22-2019 at 01:07 PM.

  9. #9
    Hooking up an external monitor

    Member Since
    Dec 27, 2006
    Location
    New York
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    32
    Your Mac's Specs
    Imac 21.5 and MBP
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    Thank you all for your suggestions. I have narrowed it down. The USB-c ports on my I-mac are not working. So its at the Apple Store now being repaired (new logic board). Thanks again.

  10. #10
    Hooking up an external monitor
    chscag's Avatar
    Member Since
    Jan 23, 2008
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    Keller, Texas
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    59,020
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    2017 27" iMac, 10.5" iPad Pro, iPhone 7+, iPhone 8, Numerous iPods, Mojave
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    Thanks for posting back and letting us know. Hopefully, Apple is repairing it for free.

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