Black Screen 20-30 sec. Random

Several searches, no answer found.
At random times (seems to me) but several times while getting ready to play iSpy children's game, the screen changes to black, all black lasting only a short time then returning to previous state.
At first I clicked away, ctrl/alt/esc and other ideas. Eventually, I got to the point where I waited. Seems to be about 20-30 seconds. I am wondering if I'm inadvertently doing this? This started about 2 weeks ago and only happened occasionally. Now, it's happened enough for me to know that it is an issue.
Last night, after a black out, the scree return to previous state but the picture was messed up. Not the pixels, but like parts of the screen were scooted to the left, little rectangles of parts of the screen were whited out. I realize that's not a very sophisticated explanation- maybe I can answer a question upon reply to clarify.
I don't think I have done anything different- downloads, upgrades, updates, etc.
I have several apps that diagnose and check for problems and have tried to find an issue with no luck.
Any ideas or suggestions?
Message was edited by: JunkJrawer
Message was edited by: JunkJrawer
Message was edited by: JunkJrawer

Here are a couple of quick thoughts:
--The game might be resetting the screen resolution when it loads. Try having a look at the Preferences for the game after it's up and running and see if there are any options for adjusting how the game handles graphics.
--Create a new user account on your computer and try loading the game from the new account. If the problem goes away, you know the problem is caused by something related to your main user account (BTW it's a useful practice to maintain a unique user account just for troubleshooting purposes).
--If you use Time Machine, a feature of Leopard and Snow Leopard (one of your other posts mentions your machine is running 10.4 Tiger but the profile signature line on that post says you're running 10.5 Leopard), restore the game from a date when the game was running properly.
--Try uninstalling and reinstalling the game.
Message was edited by: inandoutofgrace
Message was edited by: inandoutofgrace

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27/07/2013 11:04:04.482 WindowServer[119]: CGXSetWindowBackgroundBlurRadius: Invalid window 0xffffffff
27/07/2013 11:04:04.482 loginwindow[43]: find_shared_window: WID -1
27/07/2013 11:04:04.483 loginwindow[43]: CGSGetWindowTags: Invalid window 0xffffffff
27/07/2013 11:04:04.483 loginwindow[43]: find_shared_window: WID -1
27/07/2013 11:04:04.483 loginwindow[43]: CGSSetWindowTags: Invalid window 0xffffffff
27/07/2013 11:04:04.704 WindowServer[119]: Created shield window 0xbf for display 0x04272d40
27/07/2013 11:04:04.726 WindowServer[119]: device_generate_desktop_screenshot: authw 0x7fad92ebdb20(2000), shield 0x7fad92e6eef0(2001)
27/07/2013 11:04:04.795 WindowServer[119]: device_generate_lock_screen_screenshot: authw 0x7fad92ebdb20(2000), shield 0x7fad92e6eef0(2001)
27/07/2013 11:04:05.245 WindowServer[119]: handle_will_sleep_auth_and_shield_windows: releasing authw 0x7fad92ebdb20(2000), shield 0x7fad92e6eef0(2001), lock state 3
27/07/2013 11:04:05.246 WindowServer[119]: handle_will_sleep_auth_and_shield_windows: err 0x0
27/07/2013 11:04:05.253 com.apple.launchd.peruser.502[163]: (com.akamai.client.plist[744]) Bug: 12E55: launchd + 95444 [7DCC9489-2DF5-3807-83FA-EF5666EE8078]: 0xd
27/07/2013 11:04:05.249 WindowServer[119]: Created shield window 0xc0 for display 0x003f003d
27/07/2013 11:04:05.249 WindowServer[119]: handle_will_sleep_auth_and_shield_windows: releasing authw 0x7fad92ebdb20(2002), shield 0x7fad92e6eef0(2001), lock state 3
27/07/2013 11:04:05.249 WindowServer[119]: handle_will_sleep_auth_and_shield_windows: err 0x0
I'm now thinking to try to take the machine to its original firmware and see if it still does it, does anyone have any sugestion?
I use a lot photoshop and other image software, this computer is essential for my work. For more then one year this issue caused me problems.
Luckly i have a Macbook Pro too and i managed to do some of my work there. At last I was thinking to buy an external screen and attach it to the Macbook pro in order to work on my big images. But who wants to spend money again!!!???? This is not a fixture, this is silly. I wish to have my IMAc working again.
The warranty it's obviously over and this problem happened right after the warranty was over...
I write this post because i'm so tired of this issue and online nothing can be found apart from posts from so many people that have the same problem and no fixture has been found.
The only fixture seams to be to buy a new computer... Ole'!!!..new money flowing in in the cashier!! forget it!!! i would rather change company if apple doesn't respond to this.
For over 10 years i have been a Apple owner..
When this problem appears it's like someone it's playing a joke at you...
Comments welcome..
Thanks

Hi, I've seem to have found out the source of the problem.
The issue is related to heat, and an iMac 27" gets hot pretty fast.
If I boot the iMac straight after first start into Windows 7 I seem to get a lit built-in display at all times. I can also boot OS X first and then into Windows 7 and the built-in screen get lit every time as long as the iMac isn't hot.
Strange thing is that the monitor connected to the display port gets lit every time. So I can only assume that the heat only interfere with output to the built-in LED screen.
So this iMac is going to an Apple premium reseller for service, and I'll tell you guys how it went.

Black Screen 20-30 sec. Random

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