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  1. #1

    LelandJLK's Avatar
    Member Since
    Oct 11, 2009
    Location
    Winter Park, FL
    Posts
    174
    Specs:
    MBP 15 inch 2.8 GHz Intel Core 2 Duo 4 Gigs of ram
    External Monitor Issue
    OK here is the issue I am having. I just bought a cheap Compaq Monitor (s20222a) as an external monitor. My computer shows the monitor is connected but the monitor itself (on the screen) says "No Signal". This is very frustrating! Help please before I throw this monitor out the window.


  2. #2

    Buzzard2010's Avatar
    Member Since
    Oct 22, 2010
    Location
    Bretforton, Worcestershire
    Posts
    2,571
    Specs:
    MacBook Pro 15" 2014, 2.2GHz i7, 16GB RAM, 250GB SSD, OSX 10.9.5 - iPhone 5s 16gb
    Try setting the resolution down quite low, try 1024x768 for a start and see if it then picks up the signal. If it does, keep going up the resolutions till you find one that A: Works and B: looks alright
    If this does not work though you may want to reset PRAM & NVRAM

    Resetting your Mac's PRAM and NVRAM

    Hope this helps

    - Simon

    If you have been helped, don't forget to use the Reputation system at the top right of their post.
    May 2011
    Nominated: March 2011 & April 2011

  3. #3

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    48,024
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    How do you have the monitor attached? Which adapter and cable are you using? What kind of inputs does the Compaq have?

    Did you open System Preferences, Displays, and click on "Detect Displays"? If so, what does it say?

  4. #4

    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Location
    Texas, where else?
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    26,465
    Specs:
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
    Have you changed the input on the monitor to match the port you have the cable plugged into?
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  5. #5

    LelandJLK's Avatar
    Member Since
    Oct 11, 2009
    Location
    Winter Park, FL
    Posts
    174
    Specs:
    MBP 15 inch 2.8 GHz Intel Core 2 Duo 4 Gigs of ram
    Quote Originally Posted by chscag View Post
    How do you have the monitor attached? Which adapter and cable are you using? What kind of inputs does the Compaq have?

    Did you open System Preferences, Displays, and click on "Detect Displays"? If so, what does it say?
    Quote Originally Posted by bobtomay View Post
    Have you changed the input on the monitor to match the port you have the cable plugged into?
    Thanks for your quick responses! It turned out Bobtomay was correct...I used the wrong cable. DVI to SGA is a no go. I had the correct adapter for my MBP but wrong cable. Glad I saved my receipt to exchange cables for free! Now don't I feel like the fool.

  6. #6


    Member Since
    Dec 10, 2010
    Posts
    27
    Glad you got everything smoothed out!

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