Flashing screen when awakening my mac from sleep

Help: What can I do to fix my screen issue-- It flashes for the first 20 seconds each time when I awaken my mac from sleep mode: Thanks!
(mac pro 2007 intel based)

Thanks, Linc. I was worried that since this was a refurbished computer, it was dying again. Makes sense, although alittle annoying that nothing really warns you this is happening. I almost cycled power the first couple times it happened, thinking it was stuck while waking.

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My imac has a gray screen when waking it up from sleep mode. about 9 months ago, I installed OS X Maverick.

This is the second time this has happened, since installing OS X (9 mos. ago). (I can't recall the fix from the last incident.) Upon waking the pc up from sleep mode, I get a gray screen. Nothing works except using the Command and P & R keys to get to "reinstalling OS X", to no avail. What do I need to do to get it back to normal?
My imac is a 21.5", mid 2011 item.

Those keys do not reinstall OS X. To do that:
Reinstall Lion, Mountain Lion, or Mavericks without erasing drive
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu.
Reinstall Mountain Lion or Mavericks
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
OS X Lion- Reinstall Mac OS X
Note: You will need an active Internet connection. I suggest using Ethernet
if possible because it is three times faster than wireless.
COMMAND-OPTION-P-R keys resets the PRAM. OS X keyboard shortcuts.

My Mac shows a black screen when it wakes up from sleeping. How can i fix this?

Sometimes my Mac goes to sleep by its self and when i try to wake it up i get a black screen how can i fix this?
-Isaac Hatfield

By trying some of the suggestions mentioned in the More Like This threads.

Random dot pattern flashes on screen when I wake iMac from sleep...

I've never seen this on a Mac before, but when I wake this iMac, the screen momentarily flashes a grid of green, blue, and purple dots on a black background. Some are circular outlines, some filled-in dots. Wish I could describe it better, but it only shows up for a moment! Anyone seen this before?

You might want to read/post about this here: http://discussions.apple.com/forum.jspa?forumID=1114

Is there an AppleScript or Automator Script that will wake a Mac from Sleep?

Is there an AppleScript or Automator Script that will wake a Mac from Sleep?

Frank and All,
The following answer to your question above is complicated, but I hope it explains why my question was formed with so much frustration in it.
I have an OpenOffice(OO) Macro that was launched with Calendar at 6pm each business night. It ran properly in all Apples operating systems until I Hit Maverick(OSX10.9). From then on, the AppleScript would run from one to 3 days, then would disappear from the Calendar entry. The Calendar alert would still run, but the "OpenFile" section of the alert would disappear. I also was running elgato EyeTV HD during the day, so I would use energy saver to put my MacBook Pro to sleep at 12 Midnight and wake it again at 9am. I picked up a used Mac Mini to do the EyeTV stuff, provide AppleTV the files in H264 format through iTunes' media share, and found it had plenty of power to do the 6pm automated stuff simultaneously as well. Because I still wanted to run the OpenOffice Macro on my MacBook Pro at 6pm, and wanted to use it for a host of other things when I was on the road, I wanted it to sleep most of the time and only wake up automatically to run the 6pm OO Macro. When I called Apple about the issue I was having with Maverick and Calendar loosing the OpenFile command as part of the Alert Message, they told me the no longer supported answering AppleScript Questions but they now would support Automator questions. I pointed out that the OpenFile would also fail after one to three days if I used a Calendar Alert to launch an Automator App. At first, I did not like Automator, but now I see why Apple is pushing us to use it. Automator adds a TIME STAMP ID to the Apps developed in Automator so the first time you launch the App after a change to it, you must reply to a dialog message saying that this is the first time you are running this version of the App. If a Scammer has replaced your app with one that can reek havoc on your computer, the replacement app will not run unless you are there to agree that you know where the modified app came from and click the OK button to continue (BRILLIANT, Enhanced Security idea on Apples part). I also noticed that after Mountain Lion, the Applescript delay timing was all screwed up as well. Well I tried to use LaunchD Task Scheduler to circumvent the Calendar Problem and that worked until I upgraded to Yosemite Last week. Then LaunchD no longer worked and I am only into a few days of using The Calendar Launched Automator App to see if it will continue to run.
But I think I solved the dilemma I was having with opening an Automator App in a Sleeping Mac. I Googled up the following question, "AppleScript to wake up computer". I went thru several complex responses until I found this on that is INCREDIBLE EASEY! What came back was a brettterpstra.com response from Feb 20th,2014. What it said, in a Quick Tip: caffeinated your Terminal Article, if you wanted to wake a Mac from sleep, use the Terminal command named "Caffeine -u -t 1". I placed it in an Automator Most Used Action called "Run Shell Script -- Caffeine -u -t 1" and it worked! Now, I can put my Mac to Sleep but at 6pm, the Automator App will launch, run the "Caffeine -u- -t 1" command and proceed to work as if I had awakened the Mac From Sleep mode by pressing a keyboard key and had run the Automator Script with a double click.
Sorry for the long, drawn-out reply, but maybe this will help others.

Does anyone know what to do when a apple mac book pro screen won't wake up from sleep?

Does anyone know what to do when a apple mac book pro screen won't wake up from sleep? I have tried to restart it and it still won't come on.

Try this, which is located in your macbook pros user manual.

I have a new I Mac running mountain lion. When waking the computer from sleep, all I get is a blue screen. I have to restart the computer.

I have a new I Mac running lion 10.7. When waking the computer from sleep, all I get is a blue screen. I have to restart the computer.

Did you not bring all your important data over from your old computer? Do you have a backup of the iTunes library that you can restore? If not, then its not to late, just more work that it should be.
You should be able to:
Backup the device to the new installation
Transfer your purchases into a newly authorized library
Recover any other media using third party tools as suggested in this post from forum regular Zevoneer
Restore the device from the backup
This process should switch the association of the device to the new library, preserving the data and settings in your apps.
May also be prudent to attempt a backup to iCloud directly from the device before you start... Settings > iCloud > Storage & Backup > iCloud Backup > On. It won't save any media but it would preserve the general account settings and documents in case anything goes wrong while you are trying to extract your other data.
When you get it all fixed, make a backup!
tt2

Hey my air's screen is mess when it comes back from sleep. It is full of horizontal colorful lines. However, it becomes ok when I restart it. What's wrong with it?

Hey my air's screen is mess when it comes back from sleep. It is full of horizontal colorful lines. However, it becomes ok when I restart it. What's wrong with it?

Resetting PRAM may help.
Reset PRAM. http://support.apple.com/kb/PH4405

Tv/monitor resolution switches when mini wakes up from sleep

I have a mac mini c2d with intel graphics on leopard 10.6.2 connected to a sony 46w4100 tv. After updating to 10.6.2 when it first came out (i had used 10.6 and 10.6 aswell before this and this problem did not occur) i immediately noticed an issue. when i put my mac to sleep and wake it back up, instead of outputting to tv as a media player so that i have access to detailed picture settings, it reports itself as a PC thus limiting what i can change and the picture quality. i mainly use this as an HTPC, and its a problem since wiht my tv(not sure if ohter tv's have this), settings for connecting to dvd/blueray player/satellite receiver are extensive and picture is sharp, vs connecting it to computer where you only have the option of text and video and the video is not as vibrant or sharp. if i shutdown the mac and start again ,ir goes back to normal, but if i sleep and wake up, this behaviour occurs. 10.6 did not have this problem neither did 10.6.1. infact with 10.5 my mini always reported as PC thus i had limited options but with 10.6 i was happy to notice it was fixed.
is there someway to avoid this other than just ensuring my mac never goes to sleep (wasteful since its not in use most of the day). is anybody else seeing this issue and do you think this is a bug or aws the 10.6 and 10.6.1 behaviour a "bug" that apple has decided to fix.

also note the topic may be a bit misleading, when the mini wakes from sleep it is still outputting 1920x1080 so resolution does not change. when i first turn on mac, the sony tv shows 1080p output, full screen, etc etc and all the settings. when i wake from sleep and turn tv on, it doesnt have any any of that info so it doesnt even tell me its 1080p but it is.

VNC - Screen Resolution Problem on Wake from Sleep

My question: When it either wakes from sleep or cold boots (NOT on restart for some reason), Mac OS X seems to be confused on the previous resolution of my screen. On wake or cold boot, my main screen SOMETIMES gets set for 800x600 at 56 Hz, according to the display preference pane. I normally run at 1152x870 at 75 Hz. In the past, I have just used the "Detect Displays" command from the display preference pane. This always fixes the screen resolution and restores it to the correct setting.
This would not be a problem if I didn't have to run VNC. These screen res changes are crashing my VNC server. Here's what I do. I run a VNC server (OSXvnc is the name). I go away. Machine goes to sleep. From machine 'x' I send a wake-on-wan packet (a pain in the butt to figure out for me, BTW). My VNC Machine wakes up. I know it's awake, because I can login to it from remote, using SSH. But the screen res problem happened, and OSXvnc shuts down and won't reinitialize automatically. It says "Screen Resolution Changed - Server Reinitialized", and the "Start Server" button is waiting to be pressed. Of course, this cripples my ability to use VNC.
For what it's worth, this problem has happened with two different video cards. Granted, the first card was an ATI Radeon 9000 with 64 MB or VRAM and the second card is the same model with 128 MB VRAM. It's virtually the same card, but still, that's two different cards.
I have 2 CRT displays connected thru adapters (DVI-VGA and ADC-VGA) to the ATI. I'm running all the latest updates for Panther, according to Software Update. This problem has been with me since 10.2.3. I lived with it until it started really getting in the way (VNC crippling & such).
Any thoughts? -- iJW
G4 Dual 1 GHz MDD (no FW 800) Mac OS X (10.3.9)

One other item I just discovered. It seems that whether or not my monitors are powered on has something to do with it. When my monitors are on, the problem doesn't happen.
I like turning them off to save electricity. If I'm using the computer remotely, I already have a monitor. I don't need one powering up at my home that no one's looking at anyway. So the question still stands...
Anyone?
G4 Dual 1 GHz MDD (no FW 800) Mac OS X (10.3.9)

I have a password problem. After importing data and settings from one MacBook Pro to a new one, I have to put my iCloud password in when re-starting, but the password from the old computer in when waking the computer from sleep.

I have a password problem. After importing data and settings from one MacBook Pro to a new one, I have to put my iCloud password in when re-starting the new computer, but the password from the old computer in when waking the computer from sleep. I want to use my iCloud password on both computers consistently. How can I fix this?

The only other place to change a password for the computer login is in Users & Groups preferences. But I don't really know enough here to fix your problem. You can try fixing the keychain:
iCloud- Frequently asked questions about iCloud Keychain
Tutorial: Resolving Keychain Issues
If you can't access your keychain, or forget your password If you can't get into your keychain file because you've forgotten your password or the keychain file appears to be corrupt, there are a couple of options.
First, if you've forgotten your password, you can use the "Keychain First Aid" utility to make the keychain password the same as the login password. This can be accomplished via the following process:
1. Open Keychain Access (located in Applications/Utilities)
2. Go to the "Keychain Access" menu and select "Preferences"
3. Click the "First Aid" tab
4. Make sure the "Synchronize login keychain password" box is checked
5. Close the Preferences window
6. Go to the "Keychain Access" menu and select "Keychain First Aid"
7. Enter your username and password
8. Click the "Repair" button
The second option is to completely delete your keychain then recreate it. This routine is useful if your keychain appears to be corrupt or otherwise inaccessible. This can be accomplished as follows:
1. Launch Keychain Access (located in Applications/Utilities)
2. Click "Show Keychains" in the lower-left corner of the window.
3. Select the problematic keychain from the left-hand pane.
4. Navigate to the "File" menu and select "Delete Keychain '(name of keychain)'"
5. Check all options for deletion and press "OK"
6. Create a new keychain by going to the "File" menu, then "New" and selecting
"New Keychain"
7. You can now make this keychain your default if you desire by selecting it, then
going to the "File" menu and selecting "Make '(name of keychain)' Default"
Login as root and perform repair In some cases, problems with keychains can only be resolved when logged in as the root user.
First, you want to enable the root user:
1. OS X Mountain Lion: Enable and disable the root user
2. OS X Lion: Enable and disable the root user
3. Mac OS X 10.6: Enabling the root user
4. Enabling and using the "root" user in Mac OS X
After enabling the root user, and logging in under this account, again open Keychain Access. First attempt repairs using Keychain First Aid, and failing that, delete then recreate the keychain as described above while logged in as root.
Persistently asked for stored passwords If you are persistently asked for passwords in various applications that you have specified should be remembered in a keychain, your "login" keychain may not be active for one reason or another.
Navigate to ~/Library/Keychains/ (this is the Library folder inside your user's home folder). Find the file named "login.keychain" and double-click it.
Failing that, select the "login" keychain within the Keychain Access application and make sure it is the default keychain by going to the "File" menu and selecting "Make 'Login' Default"
Turn off Keychain synchronization in applications having problems If specific applications are experiencing issues when accessing password-protected material, the Keychain may be to blame.
The above comes from an article published on MacFixit.com.

Screen appears dimmer after waking from sleep

Hi
Recently, I've noticed the brightness of the 24" screen is dimmer after waking from sleep, regardless of the brightness setting in the Display preferences. If I restart the computer, the regular brightness returns. Curious if anyone else is seeing this happen on their Aluminum iMac?

This is normal. As already stated, after waking from Sleep, your screen gradually intensifies brightness until it reaches its full brightness setting. Sort of how GE Soft White Bulbs take a couple of minutes to warm up to achieve their final Lumens.
The reason it's instantly Bright upon Restart is that the machine goes through an initialization upon bootup where it performs a complete system check and ensures all settings are initialized and set according to your preferences. When Sleep is enabled (something I RARELY ever do) the machine lowers all operational parameters and upon waking, it slowly gets back up to speed.
Just like how putting drives to sleep causes severe lag once woken up before you can perform all functions at full speed.
Activating your screen saver is the best option.

What is preventing my Mac from sleeping?

Ever since installing Lion, both of my Mac Pros don't sleep properly.
When the machine wakes, the Mail notification sound, sounds many, many times. EG: If I have receives 100 emails since sleep, it notifies me 100 times.
How can I tell what is preventing my Mac from sleeping, or is this multiple mail sound something else?

There are few threads in this site discussing the same issue.
Causes sited are
File sharing as mentioned in your post,
Recently installed antivirus software,
External HD not properly ejected,
Print Que not cleared
and Mail constantly checking for new mail that you can change in Mail > Preference >General.
Solutions suggested are
Reset PRAM and SMC
and Repair Disk using Recovery HD.
Best.

I held down f3 and f4 when my Macbook woke from sleep......

I did this because I didn't realise that it was only asleep, I thaught it was turned off completely. I was trying to stop the startup sound by holding down the mute button and the lower volume button at the same time whilst booting up.
But when the computer woke from sleep, the screen was black and white,a progress bar consisting of ten dots which lit up in a row appeared in the middle of the screen. When the last dot had lit, it went back to normal.
Have I changed some important system or video setting?

This is normal, for some reason your computer was in 'safe sleep' mode, (like 'hibernate' on windows laptops) and that bar is the progress bar that shows when it wakes up from safe sleep.

Thunderbolt ethernet not working when computer wake up from sleep.

thunderbolt ethernet not working when computer wake up from sleep.
it will not happen in Mountain loin.

I had this problem on SL and on Lion as well, and it occures for WiFi and Ethernet connections.
In fact the internet connection was not broken as I could ping the destination usin the IP (not DNS name).
In this case the problem was related to mDNSResponder task which handles all dns queries.
It was the most frequent problem in my day to day work with SL and now Lion. It was never fixed by any patch from Apple. I tried almost all voodoo including fresh install, all possible config changes - no solution.
The only version with no problems related to network was 10.5.8. All the other versions had issues of different kind (WiFi instability (lost signal), DNS problems (for wireless and wired connection) sometimes associated with machine sleep and wake up and sometimes with no reason.
QUESTION: Is your problem independent of the access point / router you connect to.
I must say networking was (and still is) the weakest part, besides the other OS X weaknesses I experienced during 4 years of OS X usage.
No problems in the same network with Linux or Windows beeing ran natively on my iMac So hardware is OK.
Software is of poor quality. Not much more to say in this matter.
I found a very interesting article dated 1996 about programming which I think is still valid.
Link to the article: http://www.fastcompany.com/magazine/06/writestuff.html
Below the fragment (with some connection to Apple)
Software is everything. It also s***s.
"It's like pre-Sumerian civilization," says Brad Cox, who wrote the software for Steve Jobs NeXT computer and is a professor at George Mason University. "The way we build software is in the hunter-gatherer stage."

Flashing screen when awakening my mac from sleep

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