My 2011 MacBook Pro 13 stopped seeing my external monitor

My 2011 MacBook Pro 13 stopped seeing my external monitor. It is an Acer led monitor connected via hdmi cable
Running mountain lion

Kimapurado
Have you tried resetting the PRAM? shutdown the machine, hit the power button then hold down the option and command keys with your left hand, while holding them down with your right hand use your pinky to hold the 'P' key and index finger to hold down the 'R' key. hold them down until you hear the 'bong' sound twice then release the keys and let the machine bootup.
Also try resetting the SMC. Shut the machine down. Hold down the 'shiftctrloption' keys with your left hand, right hand hold down the power button for 10 seconds then release all. Power up the machine as normal.
Hope this helps. Pls update us and let us know if that helps!
Jaco

Similar Messages

  • Why won't Macbook Pro startup properly without external monitor & keyboard?

    If I connect a external monitor and keyboard to my late 2011 Macbook Pro (running Lion) it starts up just fine.
    But if I try to start it up without these (or any other devices) attached, I get no display on the internal screen and the internal keyboard is ignored (the caps lock light doesn't light up when the key is pressed).
    However, I don't think it's a hardware issue, as a PRAM reset seems to work (I get the second chime) indicating that the keyboard is OK. And I get a second or so of grey screen before the screen goes black.
    I've tried resetting my SMC and my PRAM. The latter seemed to fix the problem once - but then it came back, and won't go away again this time.
    I've also tried starting in safe, single user, and verbose mode, but none of these seem to make any difference.
    I've been having some issues installing Windows (under both BootCamp and Parallels) but wouldn't have thought that these were related.

    I have solved my own issue, so wanted to post here in case anyone else encounters the same thing.
    My Macbook was less than 90 days old, so I booked a telephone support call from Apple. But they couldn't help. So I booked a genius bar appointment. I turned up, powered up my Macbook, and it worked fine!
    Since it was working OK, there was nothing for them to investigate (though they ran some basic diagnostics anyway). But as soon as I got home it stopped working again.
    Now this was really weird, so I started eliminate anything that was different between the environments - power supply, cooling pad, laptop stand...
    My Macbook normally sits on an aluminium cooling pad, which in turns sits on a steel laptop stand. And when sitting on both of these (or just the stand) it exhibited the behaviour above. However, when I put it on a wooden desk it worked fine! So I replaced the aluminium cooler with a gel pad and it still worked fine. But why...?
    I also noticed another difference. Once I reconnected an external display and keyboard, I found that my internal display now stayed on - whereas previously it had gone off (with only the external display staying on).
    Searching on the internet, I discovered that this was normal behaviour under Lion, and what I had experienced previously was abnormal behaviour when the lid is open - but normal behaviour when the lid is closed. And since Macbooks use magnets to determine whether or not the lid is open, those who preferred the closed lid behaviour were using fridge magnets to fool their Macbooks into behaving that way.
    It seems that my stand and/or cooler was acting in the same way as a magnet, and making my Macbook think that the lid was closed. So the internal display stayed off whether or not I had an external display connected. Isolating it from the stand with a gel pad has resolved this issue.
    So I guess that Macbooks weren't designed to be used on metal surfaces...

  • 2011 Macbook Pro, running windows 7, two monitors?

    I have a 2011 Macbook Pro 13inch, running windows 7 with thunderbolt to dvi cable, can I use a dvi splitter to get two monitors with seperate desktops?
    I am currently using an external montior for one extra desktop, but I keep needing more room.

    jazzdude9792 wrote:
    It had beens sleeping running Windows 7 in my backpack while plugged in for a few hours, and you could literally cook an egg on it. It was that hot.
    If it was plugged in and recharging IN your backpack you probably got the battery hot. I don't know if there is an overheat auto-shut down feature for the battery.
    It may have woke Windows up to tell you it got hot and then crashed or tried to shutdown and couldn't.
    As far as the heat for the processor or ram, it does have an auto shut down for overheat situations but if it crash's and stays in limbo land then that part of it won't see it and it could damage things inside. Depending on how you had your backpack stuffed last time and this time it could just be a coincident on getting extra hot. Depending on what year MacPro you have you can either use the Hardware Test DVD that came with your computer (or press and hold the D key when it restarts) to check to see if it can find anything wrong.
    Or you may have a hardware problem that makes it wake up or restart by itself and Windows just happens to have the right combination to trigger it. If it's still under warranty you may want to have Apple look at it?
    Not to mention, if it's happened before then maybe it's time to see WHY it does it before it does do some damage?
    Try putting it to sleep and see if you can replicate the problem while at home.

  • Early 2011 15inch MacBook Pro not displaying on external monitor

    I have an early 2011 15 inch MacBook Pro and I tried to connect it to a Samsung U28D590D 4k display.  My computer is recognizing it as a monitor and saying that the output resolution is 2560x1440, which is what I expected considering my graphics card is an Intel HD Graphics 3000 512 MB and my chipset is an AMD Radeon HD 6490M with 256VRAM.  I just don't know why its not displaying on the monitor.  Any help will be very appreciated.

    i did manage to get a little step further and get my mac to ask about resolutions but it still won't appear on the monitor

  • Macbook Pro - Black screen and external monitor

    Hi there,
    I'm new here and it would be great if anybody could give me some advice about my Macbook Pro issue. First of all, I would like to thank all the contributors for your comments. I'll go to an Apple Store asap, but I'll really appreciate any of your comments so I'll know more about this issue and how to manage it.
    My device details are:
    Macbook Pro / 2.8 GHz Intel Core i7 / 4GB 1067 MHz DDR3 / Macintosh HD / Mac OS X 10.6.8
    NVIDIA GeForce GT 330M
    Other connected equipment:
    HP Monitor Pavilion 22xi (with an official Apple adapter - projector's plug)
    Wacom tablet Bamboo Fun (USB connection)
    I usually work with graphics software (Illustrator, Photoshop, etc.), since I bought my laptop (3-4 years ago) it has worked faultlessly. But I started to notice some problems about two weeks ago. The problem is basically always the same: After some hours of work, suddenly and randomly (it tends to happen when I click on a button) the screen turns off but the computer is still running (I can hear the fan and hard disk). As I said I use an external monitor, and it also turns off at the same time. That's why I thought it may not be a problem with the screen, it's probably related to the graphics card ?¿?
    The troubleshooting steps that I've tried are:
    After waiting several minutes and without any response, I have to restart my laptop. When it turns on a Panic Report message pops up. It says that a severe problem made me turn the laptop off suddenly (or something like that). The Panic Report says something about "kernel_task", I have no idea what it is, just in case it could help to clarify more (I've printed all these panic reports).
    I also have to mention that this laptop gets really hot on the left side, which I reckon it's a very common thing in these devices. I have to use a desktop electric fan to provide relief to both of us
    I've also disable the "Automatic graphics switching" tab in Energy Saver menu.
    Despite all of this, the screen and the external monitor are still turning off.
    Any idea?
    Thanks a lot,
    Clara

    I would suggest that you run AHT using Using Apple Hardware Test. You can either reboot the machine and press the D key, or use your second Grey disk. This would potentially show you any HW problems.
    Typically these older machines exhibit GPU issues. There is a third-party application called gfxCardStatus, that can provide some insight as well.
    This may or may not help if there are GPU issues - About NVRAM and PRAM (reset NVRAM/PRAM/SMC).
    It is possible to enable remote access (via SSH) and even if the screen is not working, the machine can be accessed remotely. Please see System Preferences -> Sharing.
    Can you run a test with both the lid of the MBP and the external monitor plugged in. Does your external monitor disconnect, but the internal one still show a screen?

  • What are the names of the ports I have in my Macbook Pro to plug an external monitor into?

    What are the names of the ports in my MacBook Pro that I can plug an external monitor into?

    You have Thunderbolt or Mini DisplayPort. If you know which external display you want or you already have it, look at the ports it has got and get a Mini DisplayPort adapter for it. There are Mini DisplayPort adapters for DVI, VGA and HDMI.
    Most external displays have DVI, VGA or HDMI. If you can use HDMI, use it, because it will provide much better quality. See > http://support.apple.com/kb/HT4241?viewlocale=en_US&locale=en_US
    Mini DisplayPort adapters can be used with Thunderbolt

  • Macbook Pro 2013 with two external monitors (Docking station)?

    Hi there,
    I am currently using an iMac 27 2013, but have come to the conclusion that a Macbook Pro 13" would suit my needs better as I now often need a mobile solution.
    However, when at home, I would like to hook it up to my two external Dell (Mini DP) monitors in order to have more workspace.
    For that, I am looking for some kind of Docking Station because it would be awesome just to have to plug in one cable and not all the USB cables for my other stuff, like midi keyboard etc.
    Is there something I can purchase that offers me all I need or would you rather stay with the iMac?
    Thank you!

    Maybe someone with a 2010 model will jump in and correct me, but as you only have a single Mini DsplayPort adapter, I don't think that it's possible to have two external models on a 2010 model. You can only do it on 2011+ via Thunderbolt using Thunderbolt Displays.
    You might want to ask your question in the Apple Cinema Display forum, though. I'm just not aware that it can be done.
    Clinton

  • HT3131 how to sleep a macbook pro when using an external monitor and a wireless keyboard and mouse

    I have a mid 2009 13" macbook pro and want to use an external HDTV with the MBP in clamshell mode. What are the steps to do this? 

    Here's the apple article:
    http://support.apple.com/kb/ht3131

  • MacBook Pro does not sense external monitor (Panasonic HDTV in my case) via thunderbolt-HDMI connection...Is update 10.8.3 helping anyone?

    My MacBook Pro (newest model in 2013 so far) does not sense external monitor (Panasonic HDTV in my case) via thunderbolt-HDMI connection...Is update 10.8.3 helping anyone else who has this issue? I returned my multiple HDMI adapters after figuring out it had to be an Apple issue n not the adapters so I can't check it myself now.
    Thanks!

    I have late 2012 MBP 13" and connect to my Panasonic Plasma correctly.
    But using the same cable, can't connect to an LG 47LM6200, the MBP detects the TV, the screen blinks blue, but the TV shows "no sinal detected" message.

  • Latest MacBook Pro 15" and two external monitors?

    Hi,
    I currently already have two Dell U2713HM monitors and was looking to purchase one of the latest model MacBook Pro 15" laptops. I was wondering if there would be any issues in connecting the two monitors via the two Thunderbolt/Mini DisplayPort connections on the laptop and achieving a resolution of 2560x1440 pixels on each external monitor?
    I was specifically looking at using one of the Henge Docks (http://hengedocks.com/pages/vertical-macbook-pro-retina#2) to connect the laptop to the monitors. And the Henge Dock states that it has Mini DisplayPort connections on it. Does the dock convert the Thunderbolt port to a Mini DisplayPort connection, or can you plug Mini DisplayPort connections directly into the Thunderbolt ports anyway?
    Cheers,
    Zolt

    I doubt that you can. Doesn't the Sound prefpane require you to select just one output device?

  • Macbook Pro 15 Mid 2014 & External Monitor

    I got a Macbook and then realized I needed an HDMI or Thunderbolt converter to SVGA.
    Got my adapter but it does not work. Is there a button or something to send the signal out?
    Can I not use SVGA? The monitor has a HDMI port on it and I never thought of it.
    Maybe I need to run to town and get a HDMI cable?
    I'll take 2 cents.

    Hi,
    I deal with very similar issues. I have Samsung S24C650PL 1080p (connected with HDMI), which I bought one year ago. I used it a lot with Windows without any issues. Last week I bought my first Macbook Pro Retina and since than it is a pain.
    All fonts are significantly more blurred than with Windows.
    Especially scanned PDFs are horrible, very difficult to read, much worse than the rest of the system.
    What is, however, really weird, if I move the Preview app with the PDF from the internal display to the external, it shows the right and sharp image for cca one second before it becomes blurred. So it is obviously software-related issue.
    I tried:
    Deactivate "Use LCD font smoothing when available" --> no effect at all
    Deactivate "Smooth text and line art" --> no effect
    Use any possible settings in "Displays" --> no effect
    Call the Apple support and talk with them for 40+ minutes --> no effect and no help
    What is even more weird, if I use Parallels with Windows, it is okay! Even in the small window and not in fullscreen, the Windows show everything just as they should - crisp and sharp lines and fonts.
    The unique "workaround" I found is related to PDFs and their readability.
    Install Acrobat Adobe, which uses obviously a different rendering engine than Preview app. (However, I don`t like the app.)
    Install Foxit Reader for Windows under Wine (even that is much better than Preview app.)
    I am pretty frustrated with these issues, because I thought Apple cares a little bit, but it is simply not true.
    And I can`t understand why MacBook Pro Retina can`t render the fonts at least so well as a cheap notebook for 200+ euros.

  • MacBook Pro and Mac Air - "external monitor"

    Is it possible to connect MacBook Pro and Mac Air and use one as an "external monitor"? And if so, which cable would I need?

    Hi Hello1852,
    Thank you for using Apple Support Communities.
    To use another Mac as a secondary display with your Mac, it will need to be an iMac, not a portable Mac.  To learn more about using another Mac as a secondary display, take a look at the article below.
    Target Display Mode: Frequently Asked Questions (FAQ)
    Cheers,
    Alex H.

  • Macbook pro 2010 with 2 external monitors without its main display

    Hi guys, I have been searching for a way to have 2 monitors without macbook's screen itself.
    I'm aware of various adapters through usb and etc.
    But Im thinking, if mac book is only capable of outputing 2 displays, why not outputing main display to one external monitor, instead of the screen on the computer, and the other external montior as a extra one?
    Is it possible ?  so basically 2 external monitor with macbooks screen switched off.
    I don't think apple tv can mirror one and add extra one   can it?
    I just want 2 big monitors instead of 1 big monitor with 1 tiny screen of the laptop.

    Maybe someone with a 2010 model will jump in and correct me, but as you only have a single Mini DsplayPort adapter, I don't think that it's possible to have two external models on a 2010 model. You can only do it on 2011+ via Thunderbolt using Thunderbolt Displays.
    You might want to ask your question in the Apple Cinema Display forum, though. I'm just not aware that it can be done.
    Clinton

  • Macbook pro poor graphics on external monitor with HDMI

    I plugged my new Macbook pro into my existing 24" LCD monitor that I previously used for my PC.  When using my PC the graphics are excellent, but when I switch over to HDMI to view my Macbook the graphics are poor, pixelated.

    Hello PersieDuncan
    Check out what the resolution is set to in System Preferences > Display and change if it needs to be. Also check out the troubleshooting in the article below for issues with internal and external display.
    Apple computers: Troubleshooting issues with video on internal or external displays
    http://support.apple.com/kb/ht1573
    Regards,
    -Norm G.

  • Macbook Pro detects non-existant external monitor.

    I've got the old school 1.83 GHz Macbook Pro, and so far have been really lucky not getting all the bugs that people have complained about. Mind you I've had my share of batteries replaced, but all-in-all, I've been pretty satisfied.
    That said, recently I've been plagued with an issue in OS X detecting external displays, specifically it detects a display which doesn't exist, and enters mirror mode or expanded desktop mode, whichever I've set it to last. This wouldn't be too big of an issue, but the display it thinks it has attached defaults to 800x600, so mirror mode reduces the resolution on my desktop. Alternatively, when in expanded desktop I lose the mouse and sometimes entire windows to this other monitor. If I "detect displays" sometimes it will go away immediately, sometimes it won't until I try again a few minutes.
    I've tried unplugging and taking out the battery and holding down the power button and what-not, but none of the obvious stuff has worked. I don't really know if this is a software issue or a hardware issue. Unfortunately, being that I bought the laptop a year and half ago, and having not bought Apple Care, if it is a hardware issue, I'm pretty much stuck, unless there is some work-around to disable multiple monitors altogether.
    Any help on this issue would be greatly appreciated, as I'm getting sick of what at first seemed a minor annoyance. Thanks.

    Hi,
    since the Display Settings are stored in the Parameter-Ram (PRAM) have you tried a PRAM reset (startup your Mac whilde holding down Command-Option-P-R keys altogether until you heard the startup chime at least 2 times).
    Maybe it helps.
    Stefan

Maybe you are looking for