IMac screen blacks out when lowering brightness?

iMac 27" mid-2010
If I lower brightness, after a short while screen cuts out - computer works fine in background.
When I am on highest brightness - everything is fine...
Does anyone know what is happening here?

Further details:
27' iMac mid-2010
3.2 GHz Intel Core i3
8 GB 1333 MHz DDR3
ATI Radeon HD 5670 512 MB
OS X 10.9.1 (13B42)

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Screens black out when starting program

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hi scolello,
Welcome to Lenovo Community Forums!
Access the Power Options through Control Panel,
- Click on the Change Plan Settings on your selected Plan.
- Now make sure that the brightness are Equal on both Plugged in and On Battery
Then Click on Save Changes
Hope this helps
Cheers!
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If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.
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IMac late 2009, screen blacks out running Yosemite 10.10.2

My iMac's screen blacks out for no apparent reason, and the computer is still running normally. But I can't see it.
I thought temperatures were to blame, resetted fans with Macs fan control to speeds, where everything is nice and cool, the problem persists.
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Please Help.

And an Etrecheck
Problem description:
iMac screen blacks out in yosemite
EtreCheck version: 2.1.8 (121)
Report generated 1April, 2015 at 15:20:46 GMT+3
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    iMac (27-inch, Late 2009) (Technical Specifications)
    iMac - model: iMac10,1
    1 3.06 GHz Intel Core 2 Duo CPU: 2-core
    8 GB RAM Upgradeable
        BANK 0/DIMM0
            2 GB DDR3 1067 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1067 MHz ok
        BANK 0/DIMM1
            2 GB DDR3 1067 MHz ok
        BANK 1/DIMM1
            2 GB DDR3 1067 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
    ATI Radeon HD 4850 - VRAM: 512 MB
        iMac 2560 x 1440
System Software: ℹ️
    OS X 10.10.2 (14C1514) - Time since boot: 1:12:55
Disk Information: ℹ️
    Hitachi HDE721010SLA330 disk0 : (1 TB)
        EFI (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 999.21 GB (554.08 GB free)
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
    OPTIARC DVD RW AD-5680H
USB Information: ℹ️
    Logitech USB Receiver
    Apple Inc. Built-in iSight
    Generic USB Storage
    Apple Internal Memory Card Reader
    Microsoft Wired Keyboard 600
    Apple Computer, Inc. IR Receiver
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
Gatekeeper: ℹ️
    Anywhere
Kernel Extensions: ℹ️
        /Library/Application Support/Avast/components/fileshield/unsigned
    [loaded]    com.avast.AvastFileShield (2.1.0 - SDK 10.10) [Click for support]
        /Library/Application Support/Avast/components/proxy/unsigned
    [loaded]    com.avast.PacketForwarder (2.0 - SDK 10.10) [Click for support]
        /Library/Extensions
    [loaded]    com.driver.LogJoystick (2.0 - SDK 10.9) [Click for support]
    [loaded]    com.logitech.driver.LogiGamingMouseFilter (1 - SDK 10.8) [Click for support]
        /Users/[redacted]/Library/Services/ToastIt.service/Contents/MacOS
    [not loaded]    com.roxio.TDIXController (2.0) [Click for support]
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    TuxeraNTFSUnmountHelper: Path: /Library/StartupItems/TuxeraNTFSUnmountHelper
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    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [running]    com.avast.update-agent.plist [Click for support]
    [loaded]    com.avast.userinit.plist [Click for support]
    [running]    com.bjango.istatmenusagent.plist [Click for support]
    [running]    com.bjango.istatmenusnotifications.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.avast.init.plist [Click for support]
    [loaded]    com.avast.uninstall.plist [Click for support]
    [loaded]    com.avast.update.plist [Click for support]
    [running]    com.bjango.istatmenusdaemon.plist [Click for support]
    [running]    com.bombich.ccchelper.plist [Click for support]
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    [loaded]    net.freemacsoft.LiteIcon.LIHelperTool.plist [Click for support]
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    QuickTime Plugin: Version: 7.7.3
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Time Machine: ℹ️
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Top Processes by CPU: ℹ️
         9%    mds
         5%    WindowServer
         3%    storedownloadd
         3%    MacsFanControl
         2%    com.avast.proxy
Top Processes by Memory: ℹ️
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    3.84 GB    Active RAM
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    739 MB    Wired RAM
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Diagnostics Information: ℹ️
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    Apr 1, 2015, 11:51:03 AM    /Library/Logs/DiagnosticReports/com.apple.AmbientDisplayAgent_2015-04-01-115103 _[redacted].crash
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I recently updated to Reader X 10.0.1. Now when I scroll through a large document my entire screen blacks out for a few seconds. So far it has recovered. I get an error message saying that the NVidia nView driver (ver. 135.50) has stopped responding. I am running Windows 7 Pro on an HP Laptop, feeding to a large Samsung monitor. Never happened prior to this update. Any fixes/ideas?

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#1 - You have 14 days from the date of purchase to return your computer with no questions asked.
#2 - You have 90 days of FREE phone tech support.
#3 - You have the standard one year Apple warranty.
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Take FULL advantage of your warranty. Posting on a message board should be done as a last resort and if you are out of warranty or Apple Care has expired.

Black out when screen is moved

My screen blacks out at times when I move the screen tipping forward and back. There is only a few positions where it will stay on. It's a 2008 black macbook running 10.7.5 and 10.6.8 Everything else is fine. Hardware test shows no problems. Any idea what kind of a repair this would be.
Thanks for any repley
Paul

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Random laptop screen Black out / Turn off .

Hi,
first of all my laptop is : HP Pavilion dv6-6160se Entertainment Notebook
to the problem now
A few days ago my laptops screen started out of a sudden shutting down/turning black( no lights at all ). This was happening while using the laptop at random. The screen had no lights, and if i use a flashlight on it there is nothing. like its turned off completelly.
Before this happens. Ths behavior varies. Sometimes it flickers from my desktop to a black screen then back on and some times not. Most of the times screen changed to a radom color (green mostly) then becomes black/shuts down.
NOTE: The laptop keeps runing, i can hear the videos playing so it probably isnt a gpu chip or gpu issue , music and games.
I searched the web for all kind of reasons that this could happen and tried some of the fixes .
Here are everything i tried and all or the details i could accumulate in past coupe of days:
1. If the screen flickers , blacks out and then turns back on i get a message that gpu drivers have stopped working and recovered ( on both amd and intel ).
2. If the screen blacks out, on rare ocasions if you close the laptop lid and let the laptop go to sleep , when waking up screen works again ( noticable due to screen moving)
3. I tried installing 4 different drivers all with clear install. ( didn't work)
4. I tried to to recover system with restore point. ( didn't work)
5. I tried to lower the screen brightness. ( didn't work)
6. tried this trick:
Turn off laptop
Remove battery
Hold the power buttong for 30-45 seconds
Plug-in the charger ( dont put the battery in )
Turn on laptop and see if it works.
Very Noticable details:
7. Since on of the rare fixes requires to move the lid i tried shaking the screen a bit or pushing it slightly to different directions. This actually does the trick and turns the screen back on ( i am right now typing this after using this "trick"
So, with this one as a hint there are a couple of stuff i have in mind but i am not sure and need help since i am not a technician.
a) There is a loose LCD cable and when i type a little vibration moves it and ends up in a black screen.
b) I read that if you use a flashlight and you cant see your desktop it means its a bad inverter.
c) Can the inverter have a lose cabe instead of the lcd ?
That's all the feedback i could give you that i can recall now.
Currecntly the screen looks ok ( maybe its the certain angle it has after i moved it so i would aprecciate a fast reply before it goes black again
EDIT: Tried to play a game for a few mins and i got the black screen again. Closed the lid so the laptop goes in sleep mode then opened it and it worked. Just for the records.
EDIT#2: Just tried to play a game again. got the blackscreen, shaked the screen a bit and it worked but for the 1st time i get the message " Application has been blocked from accessing graphics hardware" , Can it be that its the GPU after all or maybe drivers?
EDIT#3: Tried to play a game again and it seem to trigger the issue . ( i am currently running the laptop with only the intel drivers installed)
thanks in advance
Sincerely,
Ntas
P.S. Please feel free to ask me any question if you need more information, i am not a laptop expert but i know more than the average person
This question was solved.
View Solution.

Hi @Ntas
I have read through your post and it seems there are a couple of possibilities, and I noted that you have already tried several of the things I would normally suggest.
I will however post some of those links anyway for you to review, it is always possible there may be something in one of them that may have been missed or may inspire an idea of the cause. Since you mentioned that sometimes just moving the screen will cause the problem or make it disappear, that does seem like either a loose connection or maybe something like pressure on a part of the display causing the issue. Of course that last part may just mean the display is on its last legs, but hopefully not.
First I will give you a link to the service manual, to help you check the connections. Just be careful to read the sections on precautions, to protect yourself and to prevent any other damage.This manual is also useful in that it lists all the compatible parts, so if the display is defective you could use this guide to help order a compatible replacement if you choose to do so. HP Pavilion dv6 Notebook PC - Maintenance and Service Guide
Here are some other sources, that may be helpful to you.
Resolving Problems with Notebook Displays (Windows 7 and Windows 8)
Diagnosing a Liquid Crystal Display (LCD) for Damage
Also for your convenience here is the drivers page for your notebook.
HP Pavilion dv6-6160se Entertainment Notebook PC Drivers
I hope this all helps.
Malygris1
I work on behalf of HP
Please click Accept as Solution if you feel my post solved your issue, it will help others find the solution.
Click Kudos Thumbs Up on the right to say “Thanks” for helping!

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When I boot up with boot camp and dragging some windows size (like IE or Excel). The mouse pointer halted and after a few seconds the screen blacked out just like the machines is turned off. However, I discovered that the system is still running. I can perform the shut down action by input from the keyboard.
The problem does not exist when I start windows xp through VMware Fusion.
Did anyone encounter the same problem??
I just bought the iMac a few days.

Thanks for your reply, I have a wireless mouse/keyboard & called manufacturer to test both & they told me to plug the wired ones in & they did not work & the laptop has no plug for wired ones because those have rounded ends, laptop has wrong size/shape usb ports, so there is no way to test them on laptop, so now I'm hoping you or someone has an idea of what to do next, thank you for your ideas.
Teddy2014 wrote:
had the same issue, un plugged mouse, reconnected in another port and it worked. Bought another mouse, all is well

Screen blacks out after a few seconds and won't return to normal state.

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I dropped my ipad and the screen blacked out and could not be turned on even after pressing the sleep and home button.
I tried connecting the device to my computer and itunes said that it could not identify my device.

What to Do When Your iPad Won't Turn On
http://ipad.about.com/od/iPad_Troubleshooting/ss/What-To-Do-When-Your-Ipad-Wo-No t-Turn-On.htm
iOS: Not responding or does not turn on
http://support.apple.com/kb/TS3281
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http://support.apple.com/kb/TS3274
 Cheers, Tom

IMac screen blacks out when lowering brightness?

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