Unpredictable screen blackout when gaming

After about 4 years of owning my 21.5" intel iMac, I started randomly experiencing screen blackouts while playing mildly graphically-intensive games. These blackouts did not effect the actual computer, but the display flickered a little and then went black, and required a shut down and unplug. While blacked out, pressing the brightness button would make the screen show itself once or twice, but after that it remained off. This usually happens 5-10 minutes into a game, and is extremely annoying. This started happening yesterday and has happened about 10 times now. What can I do to stop this from happening?

Welcome to Apple Support Communities
As you mention your iMac screen was flickering, it may be a GPU issue. The same thing happened to me a few years ago and my iMac started flickering all the time after some days.
I recommend you to make a backup of your files onto an external drive and take the iMac to an Apple Store or reseller to get it checked. Maybe it is not a hardware problem, but it is better to be sure about this.

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FX 5700 TD-128, screen goes into standby when gaming

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If you are using the MSI drivers try using the latest nVidia Drivers
You may even have to revert back a few revisions such as the 5X.XX, as the latest drivers are aimed toward the latest VGA cards on the market and sometimes that causes problems for previous gen cards.
If the games you are playing do not require the absolute latest drivers then it is safe to go back and find the best drivers for your setup and configuration.
In that case you can access all the revisions here http://ftp://download.nvidia.com/Windows/
Overclocking without properly testing for stability can cause problems especially if the AGP bus is being overclocked.

Random screen blackout 2009 24 inch Cinema Display... HELP.

Random screen blackouts with 24 inch Cinema Display (purchased 2009). Never used with anything but same Macbook Pro (2009). No hardware changes on MBP. Just started June 6, 2012. Super annoying. Anyone else having this issue? Recommendations?

Hello, Ertjie.
The link titled Download the 24-inch LED Cinema Display Update from the kb/TS4045 article worked for me when I tried it today. Click the "Download" link I post here or try the one in the kb article again. Perhaps it will work for you now?
However, I note that the kb article expressly states that this firmware update:
...is only intended for use with and will only install on the Apple 24-inch LED Cinema Display while the display is connected to a Thunderbolt-enabled Mac. (EZ Jim emphasis added)
If your Mac is really using Mac OS X (10.6.8) as shown in your initial topic posting, your Mac may not be Thunderbolt-enabled. If so, contact Apple or your Apple-Authorized Service Provider for help.
Message was edited by: EZ Jim
Mac OSX 10.8.3

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why does my safari blackout when i move within a website. eg i am at my bank website, i go to pay bill and the screen goes black, or at my school site, i go to print off a form and it goes black.

Back up all data.
Triple-click the line of text below to select it, the copy the selected text to the Clipboard (command-C):
/Library/Internet Plug-ins
In the Finder, select
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From the folder that opens, remove any items that have the letters “PDF” in the name. You may be prompted for your login password. Then quit and relaunch Safari, and test.
The "Silverlight" web plugin distributed by Microsoft can also interfere with PDF display in Safari, so you may need to remove it as well, if it's present.
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Screen blackout running Windows 7 in Bootcamp

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I have a similar issue which first occurred today. I was using Windows, and had been logged in for several days, when suddenly a relatively small blue box appeared in an otherwise black screen. I didn't have time to read what appeared in it. I started up in Windows afterward and the start up process seemed normal, i.e., all was visible in the OS and I could enter my password. But, presumably after accepting the password, I only received a black screen. This continued until I used the power button. After briefly pressing the power button, I could see the mouse pointer and a spinning icon and the computer would then shutdown. I hadn't been installing or updating any software in Mac OS or Windows before this incident.

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Hi Squiji,
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does that count as an easy, safe, reliable, non-technical way?
Another nice trick:
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I had the same problem.
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https://igppwiki.ucsd.edu/groups/publichelpwiki/wiki/a1538/Howto_Disable_Acrobat _as_the_Safari_PDF_Viewer.html

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<pre><nowiki>body { overflow-x: scroll !important; }</nowiki></pre>
* Stylish: https://addons.mozilla.org/firefox/addon/stylish/

In my macbook pro 15 inch mid 2012 model, my cpu and gpu will get very hot, when gaming or rendering sometimes over 200F. The fans only spin at max about 2900 rpm, when their max is 6400. I downloaded a fan control app, but how can i fix it?

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I see that you have concerns about your operating temperature of your computer while using resource-heavy applications such as gaming applications. I have an article that will address some of the concerns you have mentioned:
Mac notebooks: Operating temperature - Apple Support
http://support.apple.com/en-is/HT201640
While there are third-party utilities that measure the temperature of a notebook computer, it is important to understand that these utilities are not measuring the external case temperature. The actual case temperature is much lower. Never use third-party applications to diagnose possible hardware issues—instead, contact Apple or go to an Apple Retail Store or Apple Authorized Service Provider.
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Learn about the fans in your Mac - Apple Support
http://support.apple.com/en-is/HT202179
Thanks for being a part of the Apple Support Communities!
Cheers,
Braden

I have a new Macbook Pro. When watching Youtube videos, it works perfectly until I attempt to watch the video in full screen. When in full screen, the video freezes immediately and the audio continues. When minimized it works fine as before. Help?

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Check your keychains in Keychain Access for excessively duplicated items.
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Select the 50 or so most recent entries in the log. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V). You're looking for entries at the end of the log, not at the beginning.
When posting a log extract, be selective. Don't post more than is requested.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some personal information, such as your name, may appear in the log. Anonymize before posting. That should be easy to do if your extract is not too long.

Populating the screen field when the cursor moves to that field

hi every one,
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THANKS & REGARDS.
Mahanta.
POINTS WILL BE REWARDED.

Sorry but look at this SAP documentation <a href="http://help.sap.com/saphelp_nw2004s/helpdata/en/54/0608162d0711d295520000e8353423/frameset.htm">User Actions on Screens</a>
Extract :
<i>User Actions on Screens
There are various ways in which users can interact with screens.
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Regards

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Unpredictable screen blackout when gaming

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