Results 1 to 12 of 12
  1. #1


    Member Since
    Jul 19, 2013
    Posts
    7
    Question Left CMD stopped working with bottom row of keys
    My left CMD key stopped working in combination with the key-row z x c v b n m, so I cannot use the shortcuts CMD-c CMD-v or CMD-b anymore.

    However, other combinations work without problem (CMD-arrows, CMD-i or CMD-u, etc).

    Only the left CMD key is affected - the right one works.

    What could possibly be the reason?
    Thank you!
    E.

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    48,030
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    Spill anything on your keyboard lately or perhaps in the past?

  3. #3


    Member Since
    Jul 19, 2013
    Posts
    7
    Yes, a few days ago a bit of water, but it was only a couple of drops, and only on the far right side of the keyboards (arrows keys, a bit of trackpad).

    Could that be the cause? Is it a resolveable issue?

  4. #4

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    48,030
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    Unfortunately even a few drops of water getting into the keyboard is enough to cause the problem you're having. Keep your machine turned upside down and allow it to dry out completely for a few days and try again. If you have the same problem after that, it may require changing out the keyboard.

  5. #5


    Member Since
    Jul 19, 2013
    Posts
    7
    Thank you for your replies chscag. How can that problem be caused by a spill? Since every single key is working properly, that hardware seems to be all right? Or are specific key combinations really hardware and not software? I cannot really believe that to be the case.

  6. #6

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    48,030
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    Spills are unpredictable and can cause all sorts of strange things to happen especially when the spill is on the keyboard. Why do you think I asked you the question in the first place in my reply to you? We have a entire Sticky Thread devoted to spills which if you like, you can read through and get some idea of what other folks have experienced. You'll find that thread at the top of this forum.

  7. #7


    Member Since
    Jul 19, 2013
    Posts
    7
    I did read that one before I posted, of course - but that weird interaction effects of one key + certain specific keys was not mentioned.

    Seeing that - as far as I know - combinations of keys are not hardcoded, but done by software (which has to be the case, since you can remap keys), the problem I have cannot be a hardware problem. At least it wouldn't make any sense in the way I understand computers.



  8. #8


    Member Since
    Jan 22, 2010
    Location
    Victoria, BC
    Posts
    20,911
    Specs:
    Mid-2012 MBP (16GB, 1TB HD), Monoprice 24-inch second monitor, iPhone 5s 32GB, iPad Air 2 64GB
    Seeing as how you're apparently drinking over your computer, you're probably also eating over it. So I suspect there's some crumbs that have worked their way into the computer as well.

  9. #9


    Member Since
    Jul 19, 2013
    Posts
    7
    Quote Originally Posted by chas_m View Post
    Seeing as how you're apparently drinking over your computer, you're probably also eating over it. So I suspect there's some crumbs that have worked their way into the computer as well.
    Your speculation about my eating habits will surely help solve the problem, thank you.

    Let me ask again: how does the keyboard work? I assume that each key goes down and if you press it, a signal is released. But that is not how a combination of keys work. If you push CMD and you push b at the same time, both signals are released individually, and the SOFTWARE determines that this makes something bold.

    So how can a problem with specific combination of keystrokes possibly be caused by a spill?

  10. #10


    Member Since
    Mar 09, 2011
    Posts
    751
    Specs:
    mbp 15 2009, mbp 13 2010

  11. #11


    Member Since
    May 05, 2009
    Posts
    256
    Specs:
    MacBook Pro with Retina Display: Core i7 2.3GHz, 16GB, 256GB, Mountain Lion
    Quote Originally Posted by Torvon View Post
    I did read that one before I posted, of course - but that weird interaction effects of one key + certain specific keys was not mentioned.

    Seeing that - as far as I know - combinations of keys are not hardcoded, but done by software (which has to be the case, since you can remap keys), the problem I have cannot be a hardware problem. At least it wouldn't make any sense in the way I understand computers.


    Yes it is hardware. I have one that does it with shift t, g, and b. The issue is there is only so many lines run for keys in the keyboard, they basically work off combinations to determine which key you pressed. The QAZWSX and Command key all have 1 common line which has been compromised because of the spill either it has become fried or is shorting out.

    Sometimes it is repairable, but it requires you to completely dissemble the keyboard (some macs you can even do this) to individual parts, clean everything and allow to air dry completely, then repair any damaged wire traces. Honestly, it is some much more worth it to replace the keyboard, I have repaired one successfully, but in the end it had to be replaced because I damaged the A key and it was now sticking.

  12. #12


    Member Since
    Jul 19, 2013
    Posts
    7
    rustyk, thank you for your comment - very helpful. i'll have it checked out!
    thanks again

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Control Keys stopped working
    By Cowboy2 in forum Other Hardware and Peripherals
    Replies: 1
    Last Post: 07-23-2014, 03:25 AM
  2. Left and Right arrow keys are not working
    By eldan88 in forum Apple Desktops
    Replies: 9
    Last Post: 07-30-2013, 05:26 PM
  3. cmd-tab app switcher stopped working
    By terrapin54 in forum OS X - Operating System
    Replies: 3
    Last Post: 02-23-2012, 08:57 PM
  4. 8 i k , and left/right arrow keys randomly stop working
    By Squeee223 in forum Apple Notebooks
    Replies: 5
    Last Post: 03-03-2010, 01:44 PM
  5. Front Row has suddenly stopped working
    By mcteethinator in forum OS X - Operating System
    Replies: 5
    Last Post: 08-20-2007, 12:42 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •