Multiple display won't work

I have connected two different monitors to my late 2009 IMAC. The multiple display works fine but when I shutdown the computer the secondary monitor won't wake up unless I unlug the video cord and plug it in again. Any solutions?

Hi Michael, thanks for your reply.
Regarding the GPU failure, I had my doubts about this simply because the external display at any resolution and 'screen share' are fine and that would seem to imply the GPU itself is fine.
I don't have an answer and I suspect it's going to require a new logic board, but from what I know that is an expensive fix and that would be unaffordable meaning the MBP will effectively become a MacMini which I'd really like to avoid.
Is there anything else I can try?
Simeon

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Help please. Extended display won't work on MBP and AOC 20" 1600 x 900 60HZ monitor. Mirror display does. I've a mini dvd to vga converter cable. Should this work?

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I have the same mini display port adapter and Belkin DVI-HDMI cable (but a Panasonic 42" Plasma HDTV) so just set this up on it to see if I could duplicate your problem, unfortunately for you (but good for me) I can't.
I connected the adapter+HDMI cable before switching the HDTV on and then powered up the MBP. It (the HDTV) came up with my background right away (it's set at Mirror not extended Desktop) and when I run System Preferences/Displays get the following. Sorry but all I can confirm is that adapter+cable combination should work ...
Try doing a Parameter RAM reset - hold down command/option/p/r keys at start up and wait for three chimes before releasing the keys?

External display won't work on Window

Hi can anyone please help me in this? when I using window XP, my external display won't display out but when I'm using MAC OS X it work well, why? please help... Thanks

I can only help if you are using an NVidia graphics card, as with that you can use the NVidia Control Panel to setup the external display.
Connect the display
Start NVidia Control panel
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Then select Change Display Configuration
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I have 2 macbooks, and my thunderbolt display won't work on one. HELP!

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Dana

Welcome to the Apple Support Communities
Note that the Thunderbolt Display can only work with Macs with Thunderbolt ports (Early 2011 and newer MacBook Pro). If your Mac is older, it won't connect to this display.
To check what MacBook Pro you have, see > http://support.apple.com/kb/ht4132 If you have a Mid 2010 or older MacBook Pro, you can't use it with your Thunderbolt Display

Why Apple Thunderbolt Display won't work on BootCamp Win7 64-bit while being plugged to MBA?

Hello,
I have MBA (latest) & installed win7 64-bit in BootCamp, I do also have Apple Thunderbolt 27" Display.
When I disconnect the ATD and re-connect it in Mac OS X, it works fine like a charm, but when I disconnect then re-connect in BootCamp, it doesn't work at all whatsoever, in fact, I have to restart my MBA (while thunderbolt is connected) to make it work in BC, this is the only way to make it work.
So, my question is; If I disconnected ATD in BootCamp then re-connected it, why it won't work?
I've googled everywhere about this issue, but no luck.
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to calculate how much video ram is needed one
take
the vertical number of pixels and * with horisontal number of pixels and * with 32bit colour which is 4 bytes
so if it's the 13" macbook air
1440 * 900 * 4 = 5.184MB for main display
+
2560 *1440 *4 = 14.75MB for second display
sounds like the intel hd 5000 would have that as dedicated memory even if the windows driver did not allow to use shared system mem as extra
could be a problem with the driver for windows
maybe a person who ran a setup like yours would have more to contribute with
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Multiple apps won't work

These two instances may be unrelated but it seems unlikely:
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More importanyly the app that I had been using just this morning for a class "Dr.racket" would not open after the above event and would just return "DrRacket cannot be opened because of a problem. Check with the developer to make sure DrRacket works with this version of OS X. You may need to reinstall the application. Be sure to install any available updates for the application and OS X." I have os x 10.8.5 none of the other people in my class have this problem and I wasn't having it this morning. I tried reinstalling both my os x and the app "dr racket" neither helped.
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Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your personal files or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, or by corruption of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
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I'm having the same issue
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Hi - I can't get my external display to work with the MacBook in clamshell mode - It works fine with the lid open.
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Thank You.
Ash
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Mac OS X 10.6.8

Sorry - I've now got it to work.
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Hi,
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Hi,
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If QT Player can handle the playback of these files in fullscreen on the external display, then why can't Final Cut?
and I tried this Try VIEW>>VIDEO PLAYBACK>>DIGITAL CINEMA DESKTOP PREVIEW (one of those options) and make sure VIEW>>EXTERNAL VIDEO>>ALL FRAMES is on.

Sr Speedy,
1. Well, the first 2 comments on this page might be of interest: http://www.newegg.com/Product/Product.asp?Item=14-130-220&depa=1 And, yes, I know it is not the exact same card.
2. You might get better answers here: http://member.evga.com/Community/messageboard/defaultmb.asp
,dave

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Please explain.
Your wireless router is wifi.
Do you mean it works outside your home on a different wifi but does not work with your home wifi?

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Sr Speedy,
1. Well, the first 2 comments on this page might be of interest: http://www.newegg.com/Product/Product.asp?Item=14-130-220&depa=1 And, yes, I know it is not the exact same card.
2. You might get better answers here: http://member.evga.com/Community/messageboard/defaultmb.asp
,dave

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Thank you in advance for any help you may be able to give

Hello Connarhea,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Best of luck,
Mario

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so do you have 2 different video cards driving two different monitors? or is it One video card with 2 displays?
the info you listed isnt very detailed but it does tell me you got an ATI video card with 16MB VRAM.
I assume that thats the Stock AGP 2x graphics card that came the The PowerMac G4 AGP graphics model.
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hopefully someone else will run by this topic and offer some insight aside from my own.

Multiple display won't work

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