Late-2009 A1286 external display NOT working

I realize there's a lot of talk on this issue but i can't find an answer applicable to my situation. Pro unibody with a cracked LCD Tried to bypass fixing it by hooking up an external monitor via minidisplay port-- NO luck. Very irritating. Attempts: - VGA/SVGA - DVI - HDMI All efforts went through a digital projector, an older Dell monitor and a new HP monitor. I sequenced all possible variables with order of power up and plug in... still no good. The best i can get is the generic space/galactic desktop and the cursor moving about. I really thought resolution was the issue. Since i have no means of changing my screen settings, i'm wondering if this is a hopeless venture. Is it possible to hook up the external monitor if the stock screen is out? I can adjust brigjtness and contrast still but the picture is obviously unusable. Any ideas/suggestions/direction would be greatly appreciated. Otherwise this comp is gonna be an expensive paperweight

I'm having the exact same problem since I did the last software update and I can tell you I am extremely p****d off! I rely on my macbook pro being hooked up to the tv. I am going to go into town to the Apple Store tomorrow so I will let you know how I get on.

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Macbook (Late 2007) External Display Not Working

I have an acer x243hq 1920x1080 external monitor which works with my Xbox 360 (vga cable) and my friends macbook (early 2008) but not my macbook
when plugging the external monitor into my macbook using the minidvi to dvi adapter the macbook screen goes light blue and flashes continuously until i remove the cable, the external monitor is just black (does NOT display "no signal") when the cable is removed the cpu seems to have been running at 100%.
i have tried using my friends macbook hard drive in my macbook and the problem is still there therefore the problem must be hardware related?
i have all current updates
Thanks for any replys on how i can fix this

Have you downloaded the Mac OS X (10.5.4) Combo Update? I posted my problem, very similar to yours, and in researching it I found it at: http://www.apple.com/downloads/macosx/apple/macosx_updates/macosx1054comboupdate .html. It might just be what you need!
My problem is that I am running 10.5.7, which I blame for my external display not acting like it did when I was on 10.5.6! One expert at Apple Support told me to erase my HDD, reinstall Tiger, upgrade to Leopard again, but only to 10.5.6! Has anyone any idea as to when 10.5.8 is due out? Is there a Beta?

Urgent! External Displays not working due to "USB Devices Disabled"

I use a Matrox DualHead2Go ME for two external displays. Suddenly, I got a message: "USB Devices Disabled... Unplug the device using too much power to re-enable device." Though the DualHead2Go (DH2G) works, it stops functioning seconds later. I tried resetting PRAM and SMC. The ports are fine as I can use them for other devices. If I unplug the DH2G and re-plug, my external monitors work for a few seconds, then the DH2G shuts off per internal light winking out.
I don't think this is a problem w/my DH2G so much as my macbook pro early 2011. I don't know if there is a connection, but this all seemed have happened suddenly when I fidgeted with iTunes and my iPhone 4S. I really need my external monitors for work. HELP!
I also run a lot of programs, but I've been doing this forever and I've never had problems w/my two externals usingDH2G for some time now. I have 16gigs, external HD, 500gig HD. Thank you to anyone who can help. Figures Matrox is closed on the weekends.

It's working. I have no idea why, but I'm not complaining.
Thanks,
John

Laptop Built In Display and External Display not Working

Hi all, I have a HP Envy M6-1158ca, and recently my Built-in display stopped working. I plugged it into an external display via HDMI and it showed no input. It seems as though the laptop is not booting into Windows either, as usually whenever my laptop boots into windows, the fingerprint scanner blinks letting me know I can now sign in using it. I am extremly frustrated with this, and have an unbelieveable amount of stress because this was my only PC. Please respond as soon as possible, it would be much appreciated.
Thanks in advance.
This question was solved.
View Solution.

Yes.. i think thats what might have damaged it...Notebook should always be completely powered off with the battery out and ac adapter disconnected while replacing any internal hardware..
Shouldnt be a BIOS problem....but still you can check this link..
Restoring the BIOS
Note:
If you have HP Support Assistant installed on the computer(The Blue Question Mark) then open it ==> Complete all pending Updates & Tuneups==> Restart and Check. It may solve your problem
Although I am an HP employee, I am speaking for myself and not for HP.
**Click on “Kudos” Star if you think this reply helped** Or Mark it as "Solved" if issue got fixed.

External Display not working (descriptive details in post)

Hello
Background:
I have been using a black Macbook (last year's model - before the aluminum ones came out) and connecting it to a VIZIO VW22L HDTV10T (television/monitor) via a mini-DVI to VGA adapter.
This setup always worked, although it was a bit finicky (I'd have to plug it in before closing the display to get in to work in clamshell mode, for example). I get the feeling from reading other forum posts that this is the normal case, though (which so far has been my only real gripe with OS X).
Anyway, back a couple months ago I wondered if this finicky-ness was partially caused by a messed-up preference file, so I decided to try and fix this. In the ensuing tweaking, I somehow caused my Display preferences to disappear.
After much effort trying to fix the problem, I eventually called Apple support, which ultimately recommended that I reinstall OS X. I didn't do that, and continued to work at the problem. I eventually was able to bring it back by going into my Time Machine backups and restoring all the Display preference files (I used old preferences from back when I got the external HD, so I knew they'd be "uncorrupted). However, now I'm having problems with my external display, namely that it is not working.
This problem started early this year, so it might have been caused by the 10.5.5 update, but since I had all these other problems going on, I'm not sure if that was the case.
Problem:
The Macbook doesn't seem to recognize the display, or is having problems routing video to the display, or something.
If I plug the display into the Macbook while it is running normally, the Macbook LCD will flash blue (like it picked up a new display), but them come back to normal. The monitor will go out of sleep mode for a second, but then display a "No signal" message. If I attempt to "Detect Displays" the Macbook screen will either flash blue (as before) or just do nothing.
If I have the display plugged in when I start up the Macbook, everything will proceed as normal until the time the desktop would be displayed. Instead of this, I just see a blue screen (like some generic desktop before any background is applied). The menu bar, the dock, and icons do not show up. However, I can hear various audio cues telling me the computer is running fine except for htis problem (email notifier going off, etc.).
I know the problem is not faulty hardware, because when I boot my Macbook into Windows, everything works perfectly. It therefore follows that it is an OS X problem. I downloaded both Cocktail and Applejack and run various repairs on them (most notable repairing preferences), but nothing has changed.
Any suggestions about how to try fixing this? If there's any technical detail I've missed, let me know.
Thank you in advance to everyone who tries to help.
-Richard

I have same problem. MacBook Pro (new, 2014) upgraded to Yosemite. Had been running with ViewPoint high-resolution, 27" monitor, HDMI. I tried Thunderbolt connection -- it connected, but it would not allow the external monitor to run at its native resolution (2560x1440). It would only display properly using HDMI. Just 3 days ago after I installed the latest OSx software update, and my external monitor problems started. On startup, my MacBook screen flickers non-stop. I can fix problem eventually (after several tries) by disconnecting the HDMI cable, turning OFF the external monitor power, turning external monitor back ON and then plugging in the HDMI to my MacBook Pro. This is very inconvenient.
I will try using the Thunderbolt cable. When I tried it in the past, it connected, but it wouldn't display the native resolution of my external monitor (which is 2560x1440). Can only get this resolution now with HDMI.

External Display not working with MacBook Pro 13" (early 2011)

I just bought the current MacBook Pro 13" (i7 processor). My external display (Benq 20"W, 1600x1050) always says "No Signal Detected!". I've tried it with a DVI-Adapter (Griffin Video Display Converter) and with a VGA-Adapter (LMP Mini DisplayPort-VGA-Adapter). With lower resolution I once got a picture (but with weird lines). On my old MacBook (white, 2.16 Ghz) there was never a problem with this display (also OS X 10.6.6). Who can help?

Check this post if you want more info:
http://discussions.apple.com/thread.jspa?threadID=2774718
The gist is that DVI is currently very iffy through Thunderbolt. Mini display -> mini display OR mini display -> HDMI should work fine. It's most likely not your adapter itself but the fact that it's DVI.
If you can, get a mini display -> HDMI adapter and try that (assuming your external has HDMI).
I should hear back tomorrow or Monday from apple engineers with more specific info about this issue and I will update then.
BTW- DVI anywhere in the chain will make things fail. Mini Display -> DVI and a DVI/HDMI cable won't work with any reliability (I've tested it on three completely different monitors).

External Displays not working

My 1.67 PB suddenly stopped recognizing any external display devices I have plugged in. I have tried both the S-Video and the DVI and have repeatedly clicked "Detect Displays"... nothing. With the DVI connection, the PB screen flashes blue for a second but then goes back to normal. I have tried to restart with and without an external device plugged in. I have also tried to put the PB to sleep, plug in the external device, and wake it up... nothing.
The only thing I've done to my PB between yesterday (the last time my S-video output worked) and today was to install the Final Cut Pro 5.0.3 and Cinema Tools 3.0.3 updates via Software Update.
Does anyone have any suggestions?
Thanks,
John

It's working. I have no idea why, but I'm not complaining.
Thanks,
John

Two BenQ external displays not working with new 27" iMac

I have a 27" iMac (newest model) and have been using it with a BenQ BL2710 monitor. It's connected with a mini display port to display port cable. It's been working great; I found that I had to uncheck the 'Displays have separate spaces' box in Mission Control, so I have the menu bar on the iMac'd display only.
Now, I have a 2nd BenQ BL2710 that I'm trying to hook up the same way, using the iMac's 2nd thunderbolt port. The display powers up and all 3 screens look perfect. The problem is getting the arrangement correct. I have the dock on one display, the menu bar on another, and the mouse will only work on one or two of the displays, depending on how I change the arrangement.
I want the dock and the menu bar to be on the iMac's display ply, which is in the center. Is there a trick to getting this done, or do I need a third party dock or other piece of hardware to get it to work?

I just answered my own question; apparently with two external displays connected, the dock has to be positioned on the bottom. I had it on the right of the main iMac display. Moving it to the bottom, and rearranging the position of the monitors in display preferences did the trick.
If anyone knows of a way to accomplish this without moving the dock to the bottom of the screen, I'd be interested. I'd prefer it on the right side, if possible.

Thinkpad T60 external display not working

Got a problem with attaching an external display to a thinkpad T60, it will not give a display at all on any external monitor with the FN F7 combination,
The LCD goes black on the laptop screen, but nothing appears on the external monitor
Its got an intel 945 graphics chip.
Looks like a hardware problem to me, has anyone ever come across this?

Have you tried upgrading the BIOS version...It solved partly a similar problem for me but I still have color problem.
Is somebody know why there is 7 monitors displayed in device manager and how to know which of the 4 plug and play monitor is associated with my external screen???
I have color problem with my View Sonic 2260 wm (on a Thinkpad T60 also). Strange problem and what is weird is that the problem go on and off...
Thanks,

MacBook Air - windows 7 / Bootcamp - External Display NOT WORKING

I run Windows 7 (Bootcamp) on a 9/2011 MacBook Air, how can I run an external display? Settings only give single display option there seems to be no way to either just display on an external display or to extend to an external display. Is this a bug?

You also may want to post in the Boot Camp forum, there may be some MBA users that can help you.

HPxi 23 external display not working on MBP

I just bought a HP 23xi external monitor for my early 2011 MBP, it was working fine all day, I then disconnected it because I had to go out. I attempted to connect it later and in clamshell mode as I was doing, initially it connects and displays on the HO screen but after about 20 seconds the image goes and the signal stops. I open my MBP and it mirrors my desktop. But as soon as I close it again, after 20 seconds the same thing happens again?? It's driving me crazy, I'm contemplating returning the screen as I am not sure whether it is faulty?
Any help would be greatly appreciates. Thanks in advance.

Managed to sort the issue by resetting the SMC settings, i made the mistake of disconnecting my monitor before putting my MBP to sleep. The key thing to remember seems to be to put your Mac to sleep prior to disconnecting the display.

Bootcamp - External Display not working :(

I've got a 20" external Dell LCD monitor running off of a new White Macbook. When in Mac OS, the display works perfectly. However, when rebooting in windows XP all I see is the OS loading screen before the display goes black and nothing ever shows up.
I've got the monitor connected via mini-DVI to DVI connector. If anyone else has come across this problem and can suggest a possible solution, It'd be very much appreciated!
Additional Info
All apps are completely up to date.
Running Mac OSX 10.5.6
Windows XP SP2
Apple Mini-DVD to DVI connector

After doing a little searching, I found this thread:
http://discussions.apple.com/thread.jspa?threadID=1576670
The first reply may help you out a bit. You do need to know the name of your graphics card--I can't remember what's in the new MacBooks.
You may also want to post this in the BootCamp forum, as the issue you're dealing with seems to affect several types of Macs running Windows via BootCamp.
Good luck!
~Lyssa

High DPI External Display not Working on OS X

I am developing a new monitor using high DPI laptop displays and it seems to work on every OS except OS X. And it even works on apple hardware running linux.
I get no signal at all when using it with either 10.8.5 or 10.9 using a rMBP 13" (Ivy Bridge). However, in both instances, it does detect something is plugged in, as the laptop display turns blue for a second. Also, on 10.9, it actually logs me out of my session. But I have the feeling this is just a bug in the new OS.
After plugging it in, there are no options for the display under the "displays" pref pane or with any other display-related programs such as SwichResX. However, using ioreg, I see that it is detecting the panel and it does report the correct edid.
I tried both thunderbolt ports and had the same problem. I think it's an OS issue and not a hardware issue since one of my project partners tried on a different model mac, and couldn't get it to work with OS X but it worked when he booted to windows. I also got it working with Ubuntu installed on my laptop
Below are some console logs from when I connected and disconnected the panel. Clearly something funny is going on since it seems to detect the screen at 1x1 and "Fatal error remapping framebuffer" sounds pretty bad...
I tried to do something like what's mentioned here, but to no avail:
http://www.insanelymac.com/forum/topic/208410-fixing-scrambledstretched-or-wrong -resolution-laptop-display-problems/
Any help would be greatly appreciated. Thanks. Logs below if you want more details.
Here are the logs:
When connecting:
10/26/13 12:23:51.309 AM WindowServer[86]: Received display connect changed for display 0x42804c0
10/26/13 12:23:51.346 AM WindowServer[86]: Created shield window 0x81f for display 0x042804c0
10/26/13 12:23:51.346 AM WindowServer[86]: handle_will_sleep_auth_and_shield_windows: no action for lock state 1
10/26/13 12:23:51.347 AM WindowServer[86]: Received display connect changed for display 0x3f003d
10/26/13 12:23:51.347 AM WindowServer[86]: Received display connect changed for display 0x3f003e
10/26/13 12:23:51.347 AM WindowServer[86]: Received display connect changed for display 0x3f003f
10/26/13 12:23:51.348 AM WindowServer[86]: _MPCompleteConnectChange: Fatal error remapping framebuffer
10/26/13 12:23:51.672 AM WindowServer[86]: Display 0x042804c0: GL mask 0x1; bounds (0, 0)[1280 x 800], 25 modes available
Main, Active, on-line, enabled, built-in, boot, OpenGL-accel, Vendor 610, Model a013, S/N 0, Unit 0, Rotation 0
UUID 0x000006100000a01300000000042804c0, ColorProfile { 2, "Color LCD"}
10/26/13 12:23:51.672 AM WindowServer[86]: GLCompositor: GL renderer id 0x01024400, GL mask 0x0000000f, accelerator 0x000044bb, unit 0, caps QEX|QGL|MIPMAP, vram 1444 MB
texture units 8, texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT
10/26/13 12:23:51.672 AM WindowServer[86]: Display 0x003f003f: GL mask 0x8; bounds (2304, 0)[1 x 1], 2 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0
UUID 0xffffffffffffffffffffffff003f003f
10/26/13 12:23:51.672 AM WindowServer[86]: Display 0x003f003e: GL mask 0x4; bounds (2305, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffff003f003e
10/26/13 12:23:51.672 AM WindowServer[86]: Display 0x003f003d: GL mask 0x2; bounds (2306, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffff003f003d
10/26/13 12:23:51.991 AM WindowServer[86]: Created shield window 0x820 for display 0x042804c0
10/26/13 12:23:51.992 AM WindowServer[86]: Created shield window 0x821 for display 0x003f003f
10/26/13 12:23:51.992 AM WindowServer[86]: Created shield window 0x822 for display 0x003f003e
10/26/13 12:23:51.992 AM WindowServer[86]: Created shield window 0x823 for display 0x003f003d
10/26/13 12:23:51.995 AM WindowServer[86]: Display 0x042804c0: MappedDisplay Unit 0: Startup Mode 1280 x 800, CGSThirtytwoBitColor, Resolution 2, IOMode 0x80000000, IODepth 0x0, IOReturn 0x0
10/26/13 12:23:51.995 AM WindowServer[86]: Display added
10/26/13 12:23:51.996 AM WindowServer[86]: Display removed
10/26/13 12:23:51.998 AM WindowServer[86]: Display 0x042804c0: GL mask 0x1; bounds (0, 0)[1280 x 800], 25 modes available
Main, Active, on-line, enabled, built-in, boot, OpenGL-accel, Vendor 610, Model a013, S/N 0, Unit 0, Rotation 0
UUID 0x000006100000a01300000000042804c0, ColorProfile { 2, "Color LCD"}
10/26/13 12:23:51.998 AM WindowServer[86]: GLCompositor: GL renderer id 0x01024400, GL mask 0x0000000f, accelerator 0x000044bb, unit 0, caps QEX|QGL|MIPMAP, vram 1444 MB
texture units 8, texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT
10/26/13 12:23:51.998 AM WindowServer[86]: Display 0x003f003f: GL mask 0x8; bounds (2304, 0)[1 x 1], 2 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0
UUID 0xffffffffffffffffffffffff003f003f
10/26/13 12:23:51.998 AM WindowServer[86]: Display 0x003f003e: GL mask 0x4; bounds (2305, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffff003f003e
10/26/13 12:23:51.999 AM WindowServer[86]: Display 0x003f003d: GL mask 0x2; bounds (2306, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffff003f003d
10/26/13 12:23:52.016 AM WindowServer[86]: MPAccessSurfaceForDisplayDevice: Set up page flip mode on display 0x042804c0 device: 0x103121b90 isBackBuffered: 1 numComp: 3 numDisp: 3
10/26/13 12:23:53.347 AM WindowServer[86]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.
10/26/13 12:23:53.380 AM WindowServer[86]: Display 0x042804c0: MappedDisplay Unit 0; ColorProfile { 2, "Color LCD"}; TransferFormula (1.000000, 1.000000, 1.000000)
10/26/13 12:23:53.397 AM WindowServer[86]: Display 0x042804c0: MappedDisplay Unit 0; ColorProfile { 2, "Color LCD"}; TransferFormula (1.000000, 1.000000, 1.000000)
10/26/13 12:23:53.996 AM WindowServer[86]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.
10/26/13 12:23:54.026 AM WindowServer[86]: Display 0x042804c0: MappedDisplay Unit 0; ColorProfile { 2, "Color LCD"}; TransferFormula (1.000000, 1.000000, 1.000000)
10/26/13 12:23:54.043 AM WindowServer[86]: Display 0x042804c0: MappedDisplay Unit 0; ColorProfile { 2, "Color LCD"}; TransferFormula (1.000000, 1.000000, 1.000000)
When disconnecting:
10/26/13 12:22:53.104 AM WindowServer[86]: Received display connect changed for display 0x42804c0
10/26/13 12:22:53.121 AM WindowServer[86]: Created shield window 0x80e for display 0x042804c0
10/26/13 12:22:53.121 AM WindowServer[86]: handle_will_sleep_auth_and_shield_windows: no action for lock state 1
10/26/13 12:22:53.121 AM WindowServer[86]: Received display connect changed for display 0x3f003d
10/26/13 12:22:53.121 AM WindowServer[86]: Received display connect changed for display 0x3f003e
10/26/13 12:22:53.122 AM WindowServer[86]: Received display connect changed for display 0x3f003f
10/26/13 12:22:53.382 AM WindowServer[86]: Display 0x042804c0: GL mask 0x1; bounds (0, 0)[1280 x 800], 25 modes available
Main, Active, on-line, enabled, built-in, boot, OpenGL-accel, Vendor 610, Model a013, S/N 0, Unit 0, Rotation 0
UUID 0x000006100000a01300000000042804c0, ColorProfile { 2, "Color LCD"}
10/26/13 12:22:53.383 AM WindowServer[86]: GLCompositor: GL renderer id 0x01024400, GL mask 0x0000000f, accelerator 0x000044bb, unit 0, caps QEX|QGL|MIPMAP, vram 1444 MB
texture units 8, texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT
10/26/13 12:22:53.383 AM WindowServer[86]: Display 0x003f003f: GL mask 0x8; bounds (2304, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0
UUID 0xffffffffffffffffffffffff003f003f
10/26/13 12:22:53.383 AM WindowServer[86]: Display 0x003f003e: GL mask 0x4; bounds (2305, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffff003f003e
10/26/13 12:22:53.383 AM WindowServer[86]: Display 0x003f003d: GL mask 0x2; bounds (2306, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffff003f003d
10/26/13 12:22:53.697 AM WindowServer[86]: Created shield window 0x80f for display 0x042804c0
10/26/13 12:22:53.697 AM WindowServer[86]: Created shield window 0x810 for display 0x003f003f
10/26/13 12:22:53.698 AM WindowServer[86]: Created shield window 0x811 for display 0x003f003e
10/26/13 12:22:53.698 AM WindowServer[86]: Created shield window 0x812 for display 0x003f003d
10/26/13 12:22:53.701 AM WindowServer[86]: Display 0x042804c0: MappedDisplay Unit 0: Startup Mode 1280 x 800, CGSThirtytwoBitColor, Resolution 2, IOMode 0x80001000, IODepth 0x0, IOReturn 0x0
10/26/13 12:22:53.701 AM WindowServer[86]: Display added
10/26/13 12:22:53.702 AM WindowServer[86]: Display removed
10/26/13 12:22:53.704 AM WindowServer[86]: Display 0x042804c0: GL mask 0x1; bounds (0, 0)[1280 x 800], 25 modes available
Main, Active, on-line, enabled, built-in, boot, OpenGL-accel, Vendor 610, Model a013, S/N 0, Unit 0, Rotation 0
UUID 0x000006100000a01300000000042804c0, ColorProfile { 2, "Color LCD"}
10/26/13 12:22:53.704 AM WindowServer[86]: GLCompositor: GL renderer id 0x01024400, GL mask 0x0000000f, accelerator 0x000044bb, unit 0, caps QEX|QGL|MIPMAP, vram 1444 MB
texture units 8, texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT
10/26/13 12:22:53.704 AM WindowServer[86]: Display 0x003f003f: GL mask 0x8; bounds (2304, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0
UUID 0xffffffffffffffffffffffff003f003f
10/26/13 12:22:53.704 AM WindowServer[86]: Display 0x003f003e: GL mask 0x4; bounds (2305, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffff003f003e
10/26/13 12:22:53.705 AM WindowServer[86]: Display 0x003f003d: GL mask 0x2; bounds (2306, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffff003f003d
10/26/13 12:22:53.713 AM WindowServer[86]: MPAccessSurfaceForDisplayDevice: Set up page flip mode on display 0x042804c0 device: 0x103121b90 isBackBuffered: 1 numComp: 3 numDisp: 3
10/26/13 12:22:55.121 AM WindowServer[86]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.
10/26/13 12:22:55.152 AM WindowServer[86]: Display 0x042804c0: MappedDisplay Unit 0; ColorProfile { 2, "Color LCD"}; TransferFormula (1.000000, 1.000000, 1.000000)
10/26/13 12:22:55.168 AM WindowServer[86]: Display 0x042804c0: MappedDisplay Unit 0; ColorProfile { 2, "Color LCD"}; TransferFormula (1.000000, 1.000000, 1.000000)
10/26/13 12:22:55.706 AM WindowServer[86]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.
10/26/13 12:22:55.737 AM WindowServer[86]: Display 0x042804c0: MappedDisplay Unit 0; ColorProfile { 2, "Color LCD"}; TransferFormula (1.000000, 1.000000, 1.000000)
10/26/13 12:22:55.754 AM WindowServer[86]: Display 0x042804c0: MappedDisplay Unit 0; ColorProfile { 2, "Color LCD"}; TransferFormula (1.000000, 1.000000, 1.000000)

Don't call the Apple Store, call AppleCare. You have 90 days of free phone support so you may as well use it. The number is in your owners manual.

23" external display not working

My 2009 i7 2.8 iMac used to connect great to my 23" cinema display. Now, after a few OS updates, the 23" screen won't turn on. I had been using it for a year on another computer at work. My iMac worked fine with the 24" yesterday, but now swapping them back the 23" won't work. BUT, the 23" works on my Macbook Pro running 10.7.1. My iMac is on 10.6.8.
Any ideas of what to do? I see the white light on the monitor, but it has a black screen.
(permissions repair, ram reset, tried various mini display port to div adapters)
Thanks for your help,

Managed to sort the issue by resetting the SMC settings, i made the mistake of disconnecting my monitor before putting my MBP to sleep. The key thing to remember seems to be to put your Mac to sleep prior to disconnecting the display.

External display not working with i-mac.

Using a newer i-mac 2013. My acer monitor stopped working entirely when i installed the newest OS 10.9. Already tried the ram resets and display resets. Any help?

The display was not added as it simply won't detect if the monitor is there, "no signal detected."
Yes the display worked fine prior to upgrading to Mavericks. I just tried the shut-down and then restarted, but still no luck... I'd hate to have to take it back to the apple store and have them look at it...

Late-2009 A1286 external display NOT working

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