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Helpful answers
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Feb 18, 2011 11:30 AM in response to OS Lucinityby Kappy,Wake the computer, disconnect the monitor, put it to sleep. Never disconnect a monitor after the computer is asleep. -
Feb 18, 2011 12:04 PM in response to Kappyby cathy fasano,That's +plug the monitor back in to the laptop+, try to wake the computer, then unplug the monitor while it's awake.
This shouldn't work that way, though. I do this every day. I have external monitors at home and at work, and I'll put it to sleep, unplug the monitor, take it to the other location, plug the monitor in, then wake it up. All of my external monitor windows appear on the external monitor when the computer wakes up. But if I open it without an external monitor attached, it will wake up and show the attached screen's contents for a second or two, then there will be a blue screen, and then it will reappear, this time with all of the external monitor's windows over on my laptop screen, too. My problem is that if I unplug before it's REALLY asleep, or wake it up before plugging the monitor in, then I have to go drag all of my external monitor windows back over, which is annoying. Sometimes when I wake up wrong with the external monitor plugged in all of the stuff goes to the external monitor and the laptop screen is black, and when I unplug the monitor I get the blue screen and then everything is on my laptop screen.
There is definitely some "magic" where the laptop "knows" what you want it to do -- except when it doesn't! -
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Feb 18, 2011 12:29 PM in response to Kappyby cathy fasano,If you unplug the monitor before putting it to sleep, and/or wake it up before plugging the monitor back in, then you have to manually drag every single solitary window back from your main laptop screen to its place that it belongs on the external monitor. Which is really really tedious. Especially if you have to do it twice every single solitary freaking day as you arrive at work and as you arrive home after work. 10 minutes a day, 5 days a week -- 50 minutes per week that I don't get paid for. -
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Feb 18, 2011 4:52 PM in response to Kappyby OS Lucinity,Wake the computer, disconnect the monitor, put it to sleep. Never disconnect a monitor after the computer is asleep.
Why? This seems like a simple bug imo.
Reconnecting the monitor does not work. The monitor now remains black as well. I don't know for certain if the computer has gone to sleep, it could also be at the login screen.
All I can say for certain is; when at home I close the lid, plug the laptop into an Apple Cinema 30" with a USB keyboard/mouse, never power down, and frequently when disconnected the laptop's screen remains black, does not respond to key presses or touchpad clicks, and holding the power button until it reboots is the only solution I've found.
I'm going to try making sure it's awake, and I'm logged in before disconnecting the darn monitor. -
Feb 21, 2011 11:32 AM in response to OS Lucinityby OS Lucinity,Ok, so the laptop screen remaining black when disconnected from Cinema Display/USB keyboard is NOT related to the laptop being asleep. I was working on it, immediately disconnected the Display & keyboard, opened the lid, and it would not display anything. -
Feb 21, 2011 11:41 AM in response to OS Lucinityby OS Lucinity,To be exact about the steps that occasionally produce this bug:
Step 1) Close laptop lid.
Step 2) Connect laptop to Cinema Display & USB keyboard/mouse.
Step 3) Happily work.
Step 4) Disconnect Cinema Display & USB keyboard/mouse.
Step 5) Open laptop lid. Laptop screen is black.
This happens maybe 1 out of 3 or 4 times. And I do this perhaps 2-4 times a day. -
Apr 1, 2011 3:56 AM in response to OS Lucinityby retromac,It seems a nice trick could be (when looking at the black screen):
1. Press the start/shutdown button briefly
2. Click "S" to get the computer to sleep (actually the shortcut for the invisible shutdown dialog)
3. Wait for the computer to get to sleep.
4. Again, briefly press the start/shutdown button to wake your computer from sleep
With me, when I have a black screen, the computer correctly recognises the new situation (that is, the monitor) after waking up. -
May 13, 2011 2:15 AM in response to OS Lucinityby NOPatterson,I have an external display at work and home (both connected via DisplayPort). For months I could sleep unplug cables, go to the other location, plug everything in and press a key on the usb keyboard an the MacBook Pro would wake up -- no problem. The lid remained closed when moving between locations and the MBP would sleep.
About two weeks ago, I started experiencing this issue where the external monitor would not wakeup when pressing a key on the external usb keyboard. Sometimes I hear the MBP make sound which means it's somewhat awake. When opening the lid, the backlight on the LCD is on, but display is black. I have no idea what caused this issue to start. It now takes me 3-5 minutes to get the MBP to wake up by fiddling with plugging in/out cables, opening/closing the lid, and I get to do this now twice a day when I move locations.
Seems to be a Mac OS X 10.6.7 software bug IMO. If anyone has ideas how to resolve or work around this this, it would be greatly appreciated.
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May 21, 2011 5:27 AM in response to OS Lucinityby yogimike,I have the same issue on my MacBook Pro 2011. It only happens once in a while. I read on another post that it's simply the screen brightness. I am unable to test it since I cannot reproduce the problem. I'm sure it will happen again sometime in the next few days. If this is indeed the cause, simply pressing the F2 button should increase the brightness.
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May 21, 2011 5:54 PM in response to yogimikeby yogimike,Update: Spent all day on the phone with apple tech support. Nothing worked except erasing the hd partition and reinstalling everything. Now the problem is gone. To see if this might work for you, try creating a separate HD partition and install a fresh copy of Mac OS. If you boot from that partition, and it still does not work, then you must have a hardware problem.
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Jun 30, 2011 1:08 PM in response to OS Lucinityby POS-Expert,I have the same problem. My macbook pro doesn't wake up after disconnect from Cinema Display 27". I have to do hard reboot to get it work after removed from external display.
I have spent some times to google and found no solution. After all, I have solved the problem by doing this simple step:
- Check all the USB device that connect to external display
Since the exteral display has extra USB ports I have some devices connected to it. Make sure everything working properly. In my case, I have disconnected all the devices that connect to external USB ports. It turns out that the logictech wireless USB mouse was low battery.
I have charged the battery, remove all unnessary USB devices, the problem is gone. Now I was able to remove my macbook from external display, open the lid, and it wakes up as before.
I hope this help.
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Oct 11, 2011 2:31 PM in response to POS-Expertby joeln123,I have this same problem, worse lately, not sure why, I have 10.6.8, it seems to happen more when I try to use it quickly, for example if I drive home, then try it works, but when I want to move offices to say a conference room, I get the blue screen every time. This last time I could see the desktop behind teh blue, but everything was washed blue. Any ideas?

