External monitor is not working correctly

I recently bought an external monitor and just hooked it up. It worked right the first time, and I had the screens mirrored. I tried to change the screen resolution and it went wack. It will not pick up a steady signal on the external monitor or the macbook pro when connected. I do not regain signal to my macbook pro until I either unplug the external monitor or turn it off it works on my roommates macbook pro. I can't even change the resolution to get it back to how it was originally because the computer freezes up.
Any help on what to do to fix this?

Hi Mike,
resetting the PRAM should return the resolution to its original settings (boot up the computer while holding down the "command", "option", "P" & "R" keys. Keep them held down until the startup chime has sounded at least twice.)
If this doesn't resolve it try resetting the SMC - see http://support.apple.com/kb/HT3964
Cheers
Rod

Similar Messages

  • HT6065 I have a problem with my Mac book pro, my external monitor is not working and i need it to do my business. Please can someone help me with this.  I am running windows 8 on parallels.

    Since I have up dated my Macbook pro, my external monitor does not work. Who can help me

    It was working untill i did the update

  • External monitor simply not working - including with external dock (dual screen)

    I can't get the external monitor (aka dual screen) to work on my T60 via the VGA port. My model is currently running Windows XP and has a ATI Radeon X1300 video card.
    I'm 6 months out of warantee (although this problem started while in warantee but I can't convince Lenovo of that).
    I've tried the following:
    - ensuring "extend my monitor onto this desktop" in windows display properties
    - disabling/enabling Presentation Director and trying all the schemes
    - setting all different combinations of modes for resolution/colour on both (LCD + VGA) monitor
    - trying two different monitors and cables (which did work with other computers)
    - Updating the video drivers (from the Lenovo website) and Presentation Director to the latest versions
    I then figured it might be a hardware fault, so I tried to see if the external monitor was activated on bootup. I made sure the "LCD + VGA" option on boot was selected in BIOS. Still no joy.
    Finally, I figured the actual VGA connector was broken so I bought a compatible mini docking station (port replicator) and attached the VGA cable to that and even that didn't work.
    What on earth could be wrong if it's not the software and not the VGA connector? The video card is working as its powering the LCD display?
    Is my only option to give it in to repair (I can't afford that)?
    Michael
    Message Edited by mstrom on 07-03-2008 04:03 AM

    T23FUN wrote:
    Hi,
    Does the external connections and cables work with another system. I'd do that first.
    If all of it works with another system then it could be drivers or internal things but try that first.
    There are some driver updates on the Lenovo site. Make sure your BIOS are updated and such.
    Good Luck,
    Yup, checked the cables and monitor with another system (actually with the same laptop using a USB->VGA adaptor which isn't a long-term fix)
    Also updated to all the latest driver including a BIOS update (which I forgot to mention).
    thanks,
    Michael

  • Just did security update and restated now monitor is not working correctly

    Just did the latest security update (didn't catch the specific number), restarted my 1.83 GHZ macbook white, intel chip. Running 10.4.11.
    Monitor from has what appears to be scan lines at the bottom and are slowly creeping up the screen!
    Any help would be appreciated, don't know if I can undo the update somehow, or if it is a driver conflict?

    does an external monitor work(with descrete or optimus only since integrated doesnt drive the panel), if so, then it might be a display issue. if not, then check resolution and refresh rate.
    looks kind of like my monitor did when the resolution was wrong(computer tried 1366x768 on an FHD display)
    W530(2436-CTO): i7-3720QM, nVidia Quadro K2000M,16GB RAM, 500 GB hard drive, 128GB mSATA SSD, Ubuntu 14.04 Gnome, Centrino Ultimate-N 6300.
    Yoga 3 Pro: Intel Core-M 5Y70, Intel HD 5300, 8GB RAM, 128GB eMMC, Windows 8.1, Broadcom Wireless 802.11ac.

  • External monitor preview not working in CS5

    Well its taken almost a month to get my Production premium suite CS5 working (exit code 7 install error) I finally reinstalled win7 pro after dicking with adobe tech support for weeks (they did try to be helpful and polite) and that "cured" the install problem so now I see that the external monitor preview still dosent work as in CS4....anyone know what gives? mine dosent work even if I set to external audio either. After effects-encore and Photoshop external firewire previews all work fine so I know its a bug in Premiere...anyone logged this yet?.On a VERY positive note I absolutely love the "solidity" of Premiere ....I invested in a Quadro fx3800 and well its a beautiful thing really.....is it odd to be in love with hardware and software
    cheers y'all
    steve

    this is a well known limitation of the current CUDA drivers. Adobe is hard at work with Nvidia to solve this, but the work around is to set MPE to software in your project settings. It has high priority AFAIK.
    Wow thanks Harm that was the workaround for now ....brilliant
    cheers
    Steve

  • Secondary monitor seems not working correctly. Please help.

    I am using a secondary monitor in Lightroom and one feature does not seem to be working correctly. Let say, I want to use the Survey mode on my secondary monitor, I select my images on the first monitor, and on the secondary monitor, I press Shift+N, and all the selected images on the first monitor in the Grid view will be displayed side-by-side on my secondary monitor in the Survey mode. But the problem is when I try to click on one selected image, and try to give it a rating, it does not just rate that individual image only, it rates all of the selected images the same rating. I don't understand! That's how it works if you are using one monitor, why it does not work on the secondary monitor. Will appreciate a fix to this problem with many thanks.

    Hope someone will help with many thanks.

  • External URL Processing not working correctly

    Hi All,
    I'm building and application where JSF engine will process external URL and take the user to the destined Detail page.
    The user can reach this detail screen in two ways:
    (1) Either login on to the system and navigating through the links.
    (2) Or directly from the email-URL link
    My concern relates to point 2 :
    The user clicks some URL(http://localhost:8080/bt/someaction.faces?id=123456) in e-mail that will log the user into the system directly and then show the Details of the request. The details page has also other links. As I have learned recently - I'm using a ViewHandler class that overrides the createView method of the base Class com.sun.faces.application.ViewHandlerImpl. In this method for the passed request (in this case someaction.faces) I'm first processing userInformation(using cookie) and then calling return super.createView(fc, "/authdetails.jsp");
    (authdetails.jsp being the details page.)
    Now whenever I reach this authdetails.jsp by clicking the email URL, the subsequent links in the details page gets distorted. No matter which link(all the links are appended with "?id=123456" string) I click in the details page - instead of navigating to some other page it is opening up the same details page (by calling the DeatilsPageBean constructor) and showing a details page without any data.
    However whenever I reach the details page from Login screen it is working fine.
    Do I need to do some special configuration in faces-config.xml for correct processing of external URL.
    Please let me know whether my approach is correct.

    As an aside, let me say this:
    IT IS WORKING PERFECTLY IN NETSCAPE 7.1 but not in IE 6.0.
    i.e. When user clicks the link in email URL he is taken to details page. The details page has other links. When user clicks these links in Netscape 7.1 it is working fine and going to the destined pages, but not in IE 6.0.
    I'm at a loss what to do!

  • External headphone jack not working correctly

    I bought a new MBP before Christmas and am now having an intermittent problem with the headphone jack. I have external speakers plugged into the headphone jack. They've been working great. Yesterday, they stopped working and the speakers in my external display started working. I unplugged, replugged, the external speakers with no result. I checked the sound tab in system preferences but the external speakers don't show up. Earlier today the external speakers started working again. I had some weird switching of audio from left to right channel in the speakers and then again they turned off. I try the external speakers with my ipod and they work fine. I plugged other external speakers or ipod headphones in the computer and they don't work and aren't recognized in system preferences. Does my computer need a trip to the repair shop already? Note: I also hear occasional "pops" through the external speakers. This never happened with these speakers before. I used to use them with a Windows machine I just replaced. Please help!

    I have this same exact problem.
    Did the repair solve the problem?
    I have a wedding band and used my old MacBook to play music during the band breaks. I haven't used the MacBook Pro yet since I just bought it, but now I'm not so sure I will. I can't only imagine what type of catastrophe it would be if I had a dance floor packed full of people and the MacBook Pro decides to play through the internal speakers only.

  • 10.7.3 external monitor "input not supported"

    I have an external monitor connected with the Aplle VGA adaptor to my MBP.
    It has been working fine for the last year.
    Today I installed 10.7.3
    And now I get the message "Input Not Supported" on the external display.
    Not impressed.
    Any ideas or do I have to roll back this update.
    Cheers.

    OK now it gets silly.
    I have also had a problem, since I instaled Lion, that when I open my MBP the screen is black and no amount of encouragement will bring it to life.
    So, I have to switch on my external monitor.  My deskptop thern appears on the externam monitor, so I select "Detect Displays" from the menu bar and, kazam, my MBP screen comes to life and the desktop moves there.
    It only remains for me to switch off the external monitor and wait for Apple to provide a fix.
    Now, remember my current problem, in  that the external monitor wil not work and shows "input not supported".
    So today I opened my MBP and sadness, the screen is BLACK.  So I switched on my external monitor and WAHEY! it worked and the desktop appeared on the external monitor. 
    Excited at the prospect that my problem had somehow magilcally fixed itself overnight, I selected "Detect Displays" and my MBP screen duly appeared and the desktop meved there.
    The external monitor then stopped working and showed the message "Input Not Supported"
    I also have a related VNC problem that is still outstanding, so I think it is fair to say that there are several issues around external monitors with Lion.

  • External usb sound card is not working correctly

    When my computer usb sound card is working correctly. If your computer to sleep and wake up the sound card is working correctly. If you disable the sound card and connect again, it appears extraneous sound on the background music playing. Each time the sound is different. The sound is very similar to not match the sampling frequency. If the computer is rebooted, then the sound card is working properly again.
    Soundcard Infra-sonic.com model Amon.
    I have not experienced problems when using the same card with Mac OS 10.5.8 with the drivers for Mac OS 10.5
    Manufacturer issued driver for Snow Leopard, but the card still does not work correctly.
    Also such problems, other users complain about an external USB audio card. None of the users can not find a solution to this problem.

    Contact Infra-Sonic tech support.

  • HT5019 Why can I not find a miniport to external monitor cable that works? I have bought for different types, two from Apple, cost me $300+ and still have no external monitor. Help, please.

    Why can I not find a miniport to external monitor cable that works? I have bought for different types, two from Apple, cost me $300+ and still have no external monitor. Help, please.

    What have you bought?
    What model Mac are you running?
    What input sources are available on the display you are connecting it to?

  • Email pushing not working correctly for office email - 3 seperate devices/carriers

    We switched email hosts several months ago and since our email pushing has not worked correctly. Our host/IT guy has been very unwilling to help me through this (I get the pleasure of being the in-house IT source)
    I personally am on AT&T have no problems with the other 3 emails I have set up on my blackberry. However I receive my work account one time a day at roughly 6:15. Another user is on Alltel and he receives spotty emails throughout the day, but his gmail account comes through instantly. The third user is on nextel and he receives his 2-3 times per day.
    I began to think this was an email host issue since the three of us are all on different carriers, until I found out a fourth user, also on nextel, receives his emails fine.
    Users 1-3 are on Outlook 07 on various versions of the Curve. We have all our messages to stay on the server.
    User 4 is on the older nextel blackberry push to talk, and is not on outlook. 
    We do not have an exchange server. Our emails were all set up through our devices.
    Any suggestions? The answers I have received through our carriers is to make sure that our messages are set to be left on the server. Everyone else at the office has given up - but for me this is the quest for the Holy Grail.......I'm determined find the answer!
    Thank you in advance for any suggestions.
    Caitlin Talbot 

    Potential solution for windows for a side-by-side install. This works for me.
    To setup a firefox install side by side so that links from external programs (like email) can open (so you don't get a "Firefox is already running but is not responding" message) do the following.
    The solution entails the use of the -no-remote switch. Don't use it for the default browser. Use it for the non default browser.
    I'll use firefox 3.6 and firefox 4.0 as examples but this should work for future versions.
    + Install firefox 3.6 and Firefox 4.0 in different directories. Eg.
    C:\Program Files\Mozilla Firefox\firefox.exe
    C:\Program Files\Mozilla Firefox 4\firefox.exe
    + Open profile manager. Start > Run : firefox.exe -ProfileManager
    + In profile manager create Two Profiles.
    firefox3.6
    firefox4
    + In profile manager select firefox 4 as your default (assuming you want to default to the latest) and tick "Don't ask at startup"
    + Create two windows shortcuts.
    * General: Mozilla Firefox 4 (default). Shortcut > Target: "C:\Program Files\Mozilla Firefox 4\firefox.exe". Shortcut > Start In: "C:\Program Files\Mozilla Firefox 4"
    * General: Mozilla Firefox 3.6. Shortcut > Target: "C:\Program Files\Mozilla Firefox\firefox.exe" -p firefox3.6 -no-remote. Shortcut > Start In: "C:\Program Files\Mozilla Firefox"
    That's it. Links from external programs should now open in your default browser.
    Further details see. [http://kb.mozillazine.org/Opening_a_new_instance_of_your_Mozilla_application_with_another_profile Opening a new instance of your Mozilla application with another profile]

  • My w2207h HP Monitor is not working on my macbook pro with hdmi minidisplayport adapter. On Windows 7 via bootcamp it works. What can i do ?

    As is said my HP w2207h monitor is not working with a minidisplayport to hdmi adapter and a hdmi cable which is working fine for my PS3. So the cable is not the problem. And on my TV i also have no problems at all activating a second monitor. Therefore the adapter isnt the problem either. When i plug it in the typical bluescreen appears. Then after a few seconds it appears again and there is no second monitor recognized. I also used the "recognize Monitor" button without success. Please help me, are there any special drivers or something like that ?
    PS: bought a high end expensive adapter now because the old one was very cheap. But didnt help. Still stuck on the macbook not recognizing anything !

    If you have an external drive you can hook up to the MacBook Pro I believe there *may* be a solution by getting an image to the MacBook Air.
    On the MacBook Pro with the Windows install disk in the DVD drive fire up disk utility.  Select the DVD and then hit the "New Image" button.  Disk Utility should offer to create a disk image from the DVD.  I would put that disk image on a USB drive connected to the Pro.  You should be able to mount that image when you connect up to the Air.  Hopefully BootCamp will be able to access that all through the process.
    If that doesn't work (the drivers don't recognize the disk image once Windows gets underway for its install), you might try copying the installation files from the DVD to FAT32 formatted USB stick or drive and then using that to install Windows.  I would expect Windows would be able to see the USB FAT32 drive and I don't believe any file on the drive is going to go beyond 4GB. 
    I haven't actually tried BootCamp on the Air, since I just use VMWare which has no issue installing from anything OSX can see.  But BootCamp is going to eventually hand off operations to Windows and that's going to complicate matters--Windows has to be able to see the drive.  While I believe there are drivers that let Windows connect to that drive, there's no way to authenticate (or even load the drivers I expect) before Windows itself is loaded--so it's a "chicken/egg" problem.

  • External mouse scrolling not working

    The scrolling function of my external mouse does not work when the MacBook Pro is not plugged in with its powercord. The mouse buttons seem to be functioning.  So does as an external keyboard. My wife has the same problem (using 10.6.2 OS). There are no options in the System Preferences that deal with this. Is this just an oversight by Apple? This basically makes using an external keyboard and mouse a nonviable option for a laptop unless you are near an electric outlet. If you know of a workaround I would appreciate the information. If not, it is something Apple will have to correct as it a pretty obvious oversight.
    Thanks in advance for any advice.
    Tony

    Check your settings when it is unplugged to make sure they are still properly configured.  You might even want to try and disable the trackpad when a mouse is being used.  I would also check out USB Overdrive (Shareware).

  • Function keys are not working correctly

    I've been looking all over the various threads and I can't find an answer that solves my problem.
    Here are the details:
    I bought the computer in the U.S. where I live.
    I have a iMac 2.4GHz intel Core 2 Duo  EMC 2133 with a 20" screen. Bought it new in February 2008.
    I have Mac OS X 10.5.8  (I am waiting for my order for OS Snow Leopard to come in!!)
    I have been using a wireless mouse and Keyboard (Love not having cords!)
    Recently, my wireless keyboard got a short and quit working. I went down to the apple store and got a new wireless keyboard.
    I had the computer with me at the genius bar so, yes, the apple employee saw exactly what I have.
    I took it all home got the thing all put back together and got the new keyboard paired up and working with the computer.
    Here are the problems:
    Went to go use the function keys while using iTunes and found they weren't working properly. The F10, F11 and F12 do not control the volume of sound as the keyboard indicates they would, they instead activate dashboard, spaces, and application windows. 
    Following the advice of other threads, I looked over in the system preferences and made sure the "Use all F1, F2 etc." box was unchecked (it was unchecked), things still didn't work.
    I tried the fn key but it appears to not work at all it has no effect on the functioning of the function keys.
    I went under keyboard shortcuts in system preferences and found the F10, F11 and F12 keys, it confirms that those keys control spaces, dashboard and application windows as they are performing but shows no options to either reassign to volume control (as marked on the keyboard) or make the fn key work.
    I've gone back and forth trying various combinations of checked and unchecked boxes to see if anything would work, so far I've come up with nothing.
    A couple more important or interesting facts:
    Yes I have turned off and taken the batteries out of the old keyboard. My bluetooth connection currently shows it as disconnected.
    I have restarted the computer.
    One thing I find odd; when I go under preferences and go to Keyboard and Mouse when I go under the section "Bluetooth" it shows Bluetooth mouse with the name of the mouse and the battery level. BUT nothing is showing up under bluetooth Keyboard, I can't figure out how to change this and don't know if it is contributing to the problem.
    When I go under the bluetooth logo on the top bar I find the mouse and both keyboards referenced, the old keyboard is shown as disconnected and the other two are connected. I have tried to update the device's name but it doesn't seem to let me.
    I have double clicked on the device under bluetooth and it shows the new keyboard as discoverable, paired and connected. Hence, I am using the new keyboard to write this inquiry.
    Please, any assistance would be of great help. I have tried to be thorough in order help narrow the possible problem. Thanks!!

    Hendry
    Just thought I'd let you know.  Our suspicions were correct, it was the OS. After I installed Snow Leopard (10.6.8) all the problems were corrected.  I also updated the RAM from 1 gb to 6 gb. The mac is working all around better. Sorry it took so long to get back to everyone. My superdrive had pooped out. Rather than replace it I got an external drive from OWC connected with firewire 800.  So far everything is running very well, as far as I can tell this external drive is better than the original superdrive. My superdrive has always acted funny, infact I returned the first mac I got after a week because its superdrive was also malfunctioning. Anyway, all that to say everything seems to be fully functioning again.
    Roy
    Re: Function keys are not working correctly 

Maybe you are looking for