Dual monitor freeze on sleep

Mac OS X 10.9.5. Current model iMac: 3.5GHh i7. 32GB main mem. NVDIA GeForce GTX 780M 4096MB.
Runs fine without a second monitor. Sleep, both manual and timeout, works fine. Press any key awakes.
Plug in a second monitor (2 month old 27" Thunderbolt display) all works fine until Sleep happens, both manual and timeout, and then system is hard frozen. No wakey. Press and hold on/off key for a long time. Wait. Press on/off key 3 times, reboots and all is as before.
Only solution: Never sleep. Turn off at night to save screen hours.

Hi! Did you ever find a solution? I just bought a 2013 iMac and have the same problem- except mine will allow a login after sleep after an initial freeze of 4-5 seconds. Dual monitors as well.

Similar Messages

HT5918 Mac Pro (Late 2013) Dual monitors freeze on startup?

I've got 2 monitors, 1 HDMI and 1 MiniDisplayPort/DVI into Thunderbolt, and the computer can't start, it crashes during the boot process. The main screen freezes just as the login comes up, the MDP screen is scrambled, and the mouse cursor is a spinning pizza.
The only solution so far is to remove the MDP cable during startup, but that is a dealbreaker because dual monitors is the sole reason I bought this, and c'mon it's a really expensive computer -- even my old MacBook could handle 2 monitors!
Any insights or solutions appreciated.

Have you tried another cable and adapter?
Try another DVI monitor to help determine the cause
Are you using a Thunderbolt port not shared with the HDMI port?
See the image included here:
Mac Pro (Late 2013): Using multiple displays
Rest the SMC
Intel-based Macs: Resetting the System Management Controller (SMC)

Dual Monitors won't sleep

hi,
i just added an older cintiq 21ux to my mac pro. the other monitor is an acer h233h.
since adding the cintiq, neither monitor will go to sleep at the set time (15min). i've tried repairing permissions during a safe boot, re-installing the cintiq driver, unplugging and plugging in the cintiq and nothings seems to work.
i've run onyx and cleaned some caches but still it persists. any ideas out there?
thanks a million!
cheers,
sean

UPDATE:
seems the screen saver comes on at the appointed time. the screen goes to sleep at the appointed time, too...only to turn back on right after going black.

Dual monitor sleep problem

I have dual monitors and with 10.5.1 my second monitor will not open after it has gone to sleep. I have to shut down and start over. A simple restart will not bring it back up. I have never had this problem before. Any help??

Welcome to the Apple Forums.
In System Preferences (found under the Apple Menu in the menu bar), look at the Display pane to see if both screens are recognized by the system. Click on the Detect Displays button. This will force the system to connect to the monitor and will show you if there is an OS problem, or perhaps a hardware problem.
I keep the "Show displays in the menu bar" checked so that I can access it through the Display image in the Menu Bar at the top of the screen.
My experience is that different monitors have different capabilities of connection to the computer- some have to be "detected" every time; some connect, but have to be changed from a mirror to a span or repositioned in the arrangement pane; some just "work right"
Good luck. Joel.

OpenGL freezes computer with dual monitors and fglrx

I am trying to use the fglrx driver, and with a single monitor I seem to have gotten everything working.
However I am running into issues with two monitors. Basically, when I have two monitors any opengl program doesn't run properly.
There are two cases. If I use the xorg.conf generated by "aticonfig --initial", it still seems to detect the other monitor (although there is a black region on my gnome desktop). If an opengl program is run, the screen goes crazy where random pixels are changing different colors. I can end the program, and everything goes back to normal.
Using the program "amdcccle" I generated xorg.conf for dual monitors (I pasted it below). When I use this configuration, any opengl program completely freezes the computer instantly.
I have been looking for a while, but have not found any information that might lead to a solution. Does anyone here have any advice?
Section "ServerLayout"
Identifier "amdcccle Layout"
Screen 0 "amdcccle-Screen[1]-0" 0 0
EndSection
Section "Monitor"
Identifier "0-DFP1"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "PreferredMode" "1680x1050"
Option "TargetRefresh" "60"
Option "Position" "1920 0"
Option "Rotate" "normal"
Option "Disable" "false"
EndSection
Section "Monitor"
Identifier "0-DFP10"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "PreferredMode" "1920x1080"
Option "TargetRefresh" "60"
Option "Position" "0 0"
Option "Rotate" "normal"
Option "Disable" "false"
EndSection
Section "Device"
Identifier "amdcccle-Device[1]-0"
Driver "fglrx"
BusID "PCI:1:0:0"
Option "Monitor-DFP1" "0-DFP1"
Option "Monitor-DFP10" "0-DFP10"
EndSection
Section "Screen"
Identifier "amdcccle-Screen[1]-0"
Device "amdcccle-Device[1]-0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Virtual 3600 1920
Depth 24
EndSubSection
EndSection

+Sorry. I mean "right" in the last sentence.+
Hello.
I put my second monitor of a dual monitor set-up to the left of the main monitor - the one with the FC application, keyboard and mouse, etc. Trouble is the mouse kept hitting the left hand wall of my main monitor when I tried to send it to the second monitor. After a while I realized the mouse/computer thinks the second monitor is to its right, so I have to exit the right hand side of the main monitor to get to the one on the left.
Is there any way to instruct FC and the mouse that the second monitor is on the left? Can the mouse be instructed to "pass" through the left hand wall of the main monitor rather than the right? Or must the second monitor always go the right of the main monitor?
Thanks.
John

Dual monitor setup - primary monitor blank upon startup

Hello -
This has been vexing me for some time now. I've seen hints of this issue from other people but never the exact same circumstances and never do I see a definitive answer.
I have a dual monitor arrangement on my 8 core Clovertown (first generation) Mac Pro. After shutting the machine down, when I start it back up, the primary monitor almost always flickers very quickly then goes black while the machine boots, and the secondary monitor kicks on. Note - this never happens on restarts or waking up from sleep mode; just after starting up after completely shutting the machine down.
Exact specs are:
The afore mentioned first-gen 8 core Mac Pro (spring 2007), combined with an ATI 4870 graphics card, with the 24 inch Cinema Display LED serving as primary monitor (the one that's useless upon starting up), and my older 23 inch LCD as secondary display. Also worth noting - I'm aware the ATI 4870 is not officially supported in this generation of Mac Pro, however there were so many reports on the web of it working that I did the swap-out myself, and ended up getting the 24 inch LED since I then had the Mini Displayport on the back of my machine.
The only way I manage to get my machine working after starting back up is to restart it several times - literally up to over a dozen attempts sometimes, before the primary display finally does start functioning and I can begin working as normal.
Because there were many reports of the ATI 4870 working fine with this Mac Pro and word of other flickering monitor problems, I thought I'd ask despite the graphics card not being officially supported. Any ideas on how to remedy this problem so I don't have to keep restarting over and over before both my screens eventually work?
Thank you in advance.

So I have the same issue. I run dual 23" Apple Cinema Displays. For a while now the main monitor has had trouble waking up. I have also been unable to put the Display to sleep from the power button on the display. The other monitor seems to go to sleep fine. So when I get it to sleep and it won't start up, I usually restart and everything is fine. Today I can't get that monitor to come up at all. In addition, I have swapped ports on the video card switching the order of the monitors, no change. I also checked in my System Preferences>Display, and the system is still recognizing two monitors. So I am guessing my issue is related to the Display itself. What can be done at this point?

T510 dual monitors no longer working properly

I have a T510 running Win7 64-bit. For at least 3 years, I have had the same dual monitor setup (2 DoubleSight DS-1900S) running off my minidock with the laptop closed. The rgith monitor is the primary, running off the DVI port, while the left uses the analog port. I was away for a week at Scout camp, powered on the system once while I was there, and when I came back to the office, my monitor setup started failing.
Specifically, the right screen is active but it no longer displays the signal being sent to it. When I powercycle the screen, I can see the display for about a quarter of a second, then it goes blank. When the problem first started, I could cycle it about 20 times and eventually it would stay on, until I left the unit overnight and it went to sleep, at which point the probelm started again.
Sounds like a wonky monitor? I have a backup set of monitors that I swapped in, and had the same exact problem, so that appears to rule out a mechanical defect. More fun facts: I can only use the laptop screen as a standalone display. I cannot get the multidisplay control panel to open, even though my left screen is powered up. However, one of my programs that normally launches to my right (main) screen will still launch, but not to my laptop screen. It really wants to live on my right screen, even when that screen is not powered on (I can close the program by accessing the icon bar at the bottom of my laptop screen).
As you might surmise, this is an extremely frustrating situation. I have gone on many trips with this laptop, and each time I returned, I either plugged it into the minidock with no issues, or I had to readjust my power settings briefly to get it to work as per usual. This time, I have no clue what went wrong. Suggestions?
Solved!
Go to Solution.

I have not changed any software or drivers (knowingly), and I had already checked the cables to make sure they were all tight, so off I went to ransack the house to dig out the spare cables. DVI cable? no change. Power cable? no change. Converter cable - OMG!!!! IT WORKS!!!!
Thank you SO much! I could have sworn this was a software issue, never considered a bad cable or power unit.
Both monitors are working properly, left-to-right scroll is working properly. Now all I need is to figure out how to get all my icons/shortcuts back onto the right screen...

Satellite Pro A210 PSAFHE - Windows 7 - freezes after sleep/hibernate

I have a Satellite Pro A210 PSAFHE running dual boot Windows XP/7
Using Windows 7 - either 32 or 64 - the system always freezes after sleep/hibernate.
This never happens with XP which sleeps and hibernates OK..
There are no drivers at all for this notebook on the site http://eu.computers.toshiba-europe.com/innovation/download_drivers_bios.jsp?service=EU
I like System 7 and use it on my other computers but without sleep/hibernate I will revert to XP.

Hi
> There are no drivers at all for this notebook on the site http://eu.computers.toshiba-europe.com/innovation/download_drivers_bios.jsp?service=EU
Sorry mate but you are wrong.
All Win 7 drivers for Satellite Pro A210 are released on the Toshiba European driver page I recommend checking it again
Since this issue does not appear using Win XP, I can say for sure that this has nothing to do with the hardware but its a software related issue
I recommend updating the graphic card driver
Furthermore there is a new BIOS for Sat Pro A210 PSAFHEits v2.0
Check if you are using the latest version

2014 mac mini dual monitor problem

I just brought a mac mini (Late 2014) i have two displays monitors connected, one HDMI to DVI. and one thunderbolt to DVI. I can have both thunderbolts connected and the problem its the same, when back from sleep ,one monitor doesn't turn on. i have to disconnect one and then both work, it only happens when the mac goes to sleep. on cold restart or turning the mac on, this problem doesn't occur. any help.

I have this same problem too. I purchased the Mac Mini with the intention of running dual monitors. I'm using the HDMI and mini-display/Thunderbolt to DVI. I've also tried MiniDisplay/Thunderbolt to HDMI and I'm experiencing the same problem as angelfromfullerton. Whenever it tries to wake from sleep, it can't decide on monitor arrangement and keeps flicking between the two, making the OS unusable and forcing a reboot... EVERY TIME. I've also experienced the issue once or twice on a cold boot. It doesn't matter which Thunderbolt port is used either.
I'm going to have to return my Mac Mini unless this problem is fixed asap.
Mac Min, OSX Yosemite (10.10).

[SOLVED] Help with dual monitors (second monitor won't wake up)

Hi. I'm trying to set up dual monitors, but I can't seem to get it to work.
I've got an ASUS P8H67-M EVO motherboard, and I'm using the xf86-video-intel driver. I'm using one VGA and one HDMI.
xrandr gives this
xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 32767 x 32767
VGA1 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
1680x1050 60.0*+ 74.9
1600x1000 60.0
1280x1024 75.0 72.0 60.0
1440x900 75.0 59.9
1152x864 75.0
1024x768 75.1 70.1 60.0
800x600 72.2 75.0 60.3
640x480 72.8 75.0 66.7 60.0
720x400 70.1
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
1920x1080 60.0*+ 50.0 60.0
1920x1080i 50.0 60.1
1680x1050 59.9
1600x900 60.0
1280x1024 75.0 60.0
1280x960 60.0
1152x864 75.0
1280x720 50.0 60.0
1152x720 60.0
1440x576i 50.1
1024x768 75.1 60.0
1440x480i 60.1
832x624 74.6
800x600 75.0 60.3
720x576 50.0
720x480 59.9
640x480 75.0 60.0 59.9
720x400 70.1
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
So it looks to me like both displays are being detected. The geometry looks such that one display is on top of the other, but I can change that using an xorg.conf.d config file (e.g. https://wiki.archlinux.org/index.php/Mu … xorg.conf). I also tried using arandr.
The real problem is that the display on HDMI3 just isn't "waking up". The power is on, but it just sits there in sleep mode.
Any help would be great. I might just be missing something simple. Thanks.
Edit: I just saw a short list of window managers near the bottom of the Arch Multihead page (https://wiki.archlinux.org/index.php/Mu … _xorg.conf). I don't see openbox on that list. Does that mean I'm SOL if I want to use openbox with multiple monitors? This page seems to imply that it should work fine with openbox http://magnatecha.com/dual-monitors-wit … nd-xrandr/.
Last edited by Pacopag (2013-08-19 18:58:36)

I use XFCE, and when I boot my computer I just run:
xrandr --output DVI-I-1 --auto --output DVI-I-2 --auto --left-of DVI-I-1
I'm assuming if you modify the names appropriately that it'll work too. I have had issues before trying to run dual monitors without taking both outputs off of a single video card (which is what I'm doing now). For example, I had a graphics card with one (VGA) output and a VGA output on my motherboard. But, connecting the graphics card disabled the on-board VGA. So it is possible (I'm not an expert here) that two displays coming off the motherboard may not work for hardware reasons.

[SOLVED] Dual monitor: can't switch from X to vc

I have a dual monitor configuration on my laptop (Sony Vaio VGN-SR21M), so that I can work with the laptop screen and an external lcd at the same time. It works amazingly well, every screen has its own resolution and I can drag windows from one screen to another (ATI drivers are wonderful in this aspect!). The only problem is that I can't switch to vc pressing Ctrl+Alt+F2 or any other function key: the laptop screen freezes black, while the other shows "no input" box. Pressing Alt+F7 the X interface is restored correctly to both screens. If I start X without the external lcd the problem disappears, so I think it is a multimonitor issue. Here's my xorg.conf:
Section "ServerLayout"
#InputDevice "Mouse0" "CorePointer"
Identifier "X.org Configured"
Screen 0 "aticonfig-Screen[0]-0" 0 0
Screen "aticonfig-Screen[0]-1" RightOf "aticonfig-Screen[0]-0"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
ModulePath "/usr/lib/xorg/modules"
FontPath "/usr/share/fonts/misc"
FontPath "/usr/share/fonts/100dpi:unscaled"
FontPath "/usr/share/fonts/75dpi:unscaled"
FontPath "/usr/share/fonts/TTF"
FontPath "/usr/share/fonts/Type1"
EndSection
Section "Module"
Load "dbe"
Load "extmod"
Load "xtrap"
Load "glx"
Load "dri"
Load "freetype"
Load "synaptics"
EndSection
Section "ServerFlags"
Option "AutoAddDevices" "False"
Option "Xinerama" "on"
EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbLayout" "it"
Option "XkbVariant" ""
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
EndSection
Section "Monitor"
Identifier "aticonfig-Monitor[0]-0"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
EndSection
Section "Monitor"
Identifier "aticonfig-Monitor[0]-1"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
EndSection
Section "Device"
Identifier "Card0"
Driver "radeon"
VendorName "ATI Technologies Inc"
BoardName "Mobility Radeon HD 3400 Series"
BusID "PCI:1:0:0"
EndSection
Section "Device"
Identifier "aticonfig-Device[0]-0"
Driver "fglrx"
Option "PairModes" ""
Option "DesktopSetup" "clone"
BusID "PCI:1:0:0"
EndSection
Section "Device"
Identifier "aticonfig-Device[0]-1"
Driver "fglrx"
BusID "PCI:1:0:0"
Screen 1
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
SubSection "Display"
Viewport 0 0
Depth 1
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 4
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 8
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 15
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
Section "Screen"
Identifier "aticonfig-Screen[0]-0"
Device "aticonfig-Device[0]-0"
Monitor "aticonfig-Monitor[0]-0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
Section "Screen"
Identifier "aticonfig-Screen[0]-1"
Device "aticonfig-Device[0]-1"
Monitor "aticonfig-Monitor[0]-1"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
Maybe the solution is simple, but I'm quite a newbie so please understand me...
Last edited by snack (2009-01-27 15:42:35)

I modified xorg.conf heavily to solve another problem, with this new version I can switch to vc even with dual monitor setup (obviously the external lcd doesn't work) and then go back to X without any issue:
Section "InputDevice"
Identifier "SynapticsTouchpad"
Driver "synaptics"
Option "AlwaysCore" "true" # send events to CorePointer
#Option "Device" "/dev/input/mice"
Option "Device" "/dev/psaux"
Option "Protocol" "auto-dev"
Option "SHMConfig" "false" # configurable at runtime? security risk
Option "LeftEdge" "1700" # x coord left
Option "RightEdge" "5300" # x coord right
Option "TopEdge" "1700" # y coord top
Option "BottomEdge" "4200" # y coord bottom
Option "FingerLow" "25" # pressure below this level triggers release
Option "FingerHigh" "30" # pressure above this level triggers touch
Option "MaxTapTime" "180" # max time in ms for detecting tap
Option "VertEdgeScroll" "true" # enable vertical scroll zone
Option "HorizEdgeScroll" "true" # enable horizontal scroll zone
Option "CornerCoasting" "true" # enable continuous scroll with finger in corner
Option "CoastingSpeed" "0.30" # corner coasting speed
Option "VertScrollDelta" "15" # edge-to-edge scroll distance of the vertical scroll
Option "HorizScrollDelta" "15" # edge-to-edge scroll distance of the horizontal scroll
Option "MinSpeed" "0.15" # speed factor for low pointer movement
Option "MaxSpeed" "0.75" # maximum speed factor for fast pointer movement
Option "AccelFactor" "0.0030" # acceleration factor for normal pointer movements
Option "VertTwoFingerScroll" "true" # vertical scroll anywhere with two fingers
Option "HorizTwoFingerScroll" "true" # horizontal scroll anywhere with two fingers
Option "TapButton1" "1"
Option "TapButton2" "2"
Option "TapButton3" "3"
EndSection
#Section "InputDevice"
# Identifier "Keyboard0"
# Driver "kbd"
# Option "XkbLayout" "it"
# Option "XkbVariant" ""
#EndSection
Section "ServerLayout"
Identifier "X.org Configured"
Screen 0 "aticonfig-Screen[0]-0" 0 0
Screen "aticonfig-Screen[0]-1" RightOf "aticonfig-Screen[0]-0"
InputDevice "SynapticsTouchpad" "SendCoreEvents"
EndSection
Section "Files"
ModulePath "/usr/lib/xorg/modules"
FontPath "/usr/share/fonts/misc"
FontPath "/usr/share/fonts/100dpi:unscaled"
FontPath "/usr/share/fonts/75dpi:unscaled"
FontPath "/usr/share/fonts/TTF"
FontPath "/usr/share/fonts/Type1"
EndSection
Section "Module"
Load "dbe"
Load "extmod"
Load "xtrap"
Load "glx"
Load "dri"
Load "freetype"
#Load "synaptics"
EndSection
Section "ServerFlags"
Option "AutoAddDevices" "False"
Option "Xinerama" "on"
EndSection
Section "Monitor"
Identifier "aticonfig-Monitor[0]-0"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
EndSection
Section "Monitor"
Identifier "aticonfig-Monitor[0]-1"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
EndSection
Section "Device"
Identifier "aticonfig-Device[0]-0"
Driver "fglrx"
Option "PairModes" ""
Option "SwapScreens" "off"
BusID "PCI:1:0:0"
EndSection
Section "Device"
Identifier "aticonfig-Device[0]-1"
Driver "fglrx"
BusID "PCI:1:0:0"
Screen 1
EndSection
Section "Screen"
Identifier "aticonfig-Screen[0]-0"
Device "aticonfig-Device[0]-0"
Monitor "aticonfig-Monitor[0]-1"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
Section "Screen"
Identifier "aticonfig-Screen[0]-1"
Device "aticonfig-Device[0]-1"
Monitor "aticonfig-Monitor[0]-0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
I think it has something to do with the Screen sections, but I don't know exactly where the problem was (I changed many settings at once). Hope my new xorg.conf could be useful to someone with the same problem. Thanks everybody for the help.

Dual Monitor Behavior

Hi All,
New Mac Pro system with ATI 4870. Dual monitor setup, 23" cinema connected to mini display port and 30" cinema connected to DVI. The 23" is the default monitor during boot sequence with the 30" firing up after boot near complete. Any way to change this behavior, 30" followed by 23"?
Matt

I just don't think it really matters unless your machine is not set for automatically logging in, or running verbose or single-user mode on boot-up. The login screen would just appear in the other (secondary) monitor. It might seem to be a hassle if you are constantly messing around with the boot sequence or constantly logging in and out, sleeping or screen-saver lock.
If the 23" is your secondary (I'm assuming this is what you want) and the menubar is on the 30", I would leave well enough alone. Now if you wanted the 23" as the primary, you can use the Displays preference pane to move the menubar to the 23" (from the arrangement tab.) Just click and drag the little white bar. I'm pretty sure you know that but thought I would throw that out there.
Performance-wise, there should not be any difference between the 2 displays.
D.

Dual displays, one to sleep?

I have a dual monitor configuration with my new Mac Pro cylinder. One display is Thunderbolt, the other a Cinema Display (mini connector).
I don't always use the second display, and I have it set to it's own space. But I'm wondering if there is some clever way I can put that space/display to sleep, independently. If I switch to it, via mouse or via spaces, then it would come back to life.
I'm guessing this is not possible, as I've tried looking around.
Thanks.

SwitchResX
<http://www.madrau.com/srx_howtouseit/srx_howtouseit/srx_switchresx_menus.html>
can disable and enable displays.

Display Preferences does not detect dual monitors

Display Preferences does not detect dual monitors.
There is no workaround here.
Only a prompt update from apple will solve this.
Any level 5 geniuses I welcome your guidance... please prove me otherwise.
thanks
--Marconi

Hi marconi de baloni,
Thanks for the question. Based on what you stated, it seems like the computer is not recognizing a second display. I would recommend that you read this article, it may be able to help you resolve or isolate the issue.
OS X Yosemite: Connect multiple displays to your Mac
If a display is not recognized, choose Apple menu > System Preferences on the primary Mac, click Displays, then click Display.
Open the Display pane for me
Then click the Detect Displays button.
You can also try putting your Mac to sleep and then waking it.
Thanks for using Apple Support Communities.
Cheers,
Mario

MacBook Retina and multiple monitor switch on sleep.

Hi,
I have a MacBook Retina and use it in a Dual-Monitor setup. It has this annoying habit of refreshing it's desktop setup when it comes back from sleep/screen turned off and I have an external display connected.
My cowerker's MBPr also has the same problem. Anybody found a way to solve it? I get annoyed having to move my windows around 10 times a day...
Thanks,
- Ricardo

If you have trouble with the standard BootCamp menu, you might want to try rEFIt instead. (back up your stuff though, not one of the most safest things to install)

Dual monitor freeze on sleep

Similar Messages

Maybe you are looking for