Black screen on iMac

Hi, guys:
Recently I installed Security Update 2008-002 and Safari update, as a lot of us have done. However, unfortunately, after that, black screen frequently happens on my iMac. I can't light the screen up when it happens but pushing down the power button to switch it off.
Do you guys have this problem? What can I do? Send it to repire?

I just started experiencing these problems today, but my iMac is all of two weeks old. And to think I decided to buy an iMac over anything else because everyone I asked said they were oh-so-reliable...
My problems started as a screen flicker when I was simply running an internet browser, word processing app and iTunes. Not long after that the screen would go completely black and I would have to shut down my system. Afterwards, I would have to try to boot up 2-3 times to load Leopard without the screen staying completely black. Initially I thought it was maybe a glitch on my system, so I re-installed OSX 10.5 only to have the same problem. After the re-install, it could take sometimes up to 5 boots to load Leopard without having a black screen show up. I removed my RAM and reinstalled it with no problems, but my issue with the "black screen of death" didn't seem to go away. I'm pretty well convinced that I just need to take my desktop to an Apple store to get it fixed rather than waste my time trying to solve something giving everyone a headache.
Has anyone heard if Apple is having issues with defective video or graphics cards/drivers? That seems to be a likely issue. My hard disk is error-free after I verify it. Is there any way to run diagnostics on the video or graphics components of an iMac? Thanks.

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    Apple IMac 27 has a problem.
    Random black screen.
    Over 1 year without any successful fix.
    IMac 27 10.8.4 (12E55) - bought in 2010
    3.06 GHz Intel Core 2 Duo
    4GB 1067 Mhz RAM
    Graphics ATI Radeon HD 4670 256 MB
    The IMac computer screen goes black randomly but the machine still running beyond.
    In order to go back to normal i need to awake the computer by hitting with the pointer a hot corner previously created " sleep mode" ( top left ).
    ..the black screen would come back after one second again..and then again and then again and then again..with different intervals..sometime 2 seconds after the other, sometime as soon as appears the user login screen.
    I took the machine to an Apple Store two times over one year, they opened, cleaned it but they didn't replace anything has they could not understand what they real problem was. I was happy for that because they didn't try to make me spend money on something which was not going to solve my issue for sure.
    Last time i kindly asked them to inspect everything meticulously, part by part, i left the machine with them for over 2 months. They couldn't understand why this was happening..after couple of weeks, 5 more machines came in with the same problem.
    On some of them., upon request of the client they changed the graphic card but apparently this was not the fix, the problem come back again. Apparently changing the graphic card or the screen or else it didn't solve any problem to anyone. I'm almost thinking to "trough it out of the window"..we all spend money for this machines and i think we need to know if Apple is looking in to this or not.
    Lately i tried to do an SMS RESET and PRAM RESET, it feels it got better a little but problem still coming back.
    Also, all usb  devices are disconnected and the problem still there
    Below you will see a copy of the console report. I honestly don't understand much of it as i'm not a computer guy.
    27/07/2013 11:03:39.837 WindowServer[119]: Created shield window 0xb3 for display 0x04272d40
    27/07/2013 11:03:39.837 WindowServer[119]: device_generate_desktop_screenshot: authw 0x7fad92c79dc0(2000), shield 0x7fad92c34370(2001)
    27/07/2013 11:03:39.906 WindowServer[119]: device_generate_lock_screen_screenshot: authw 0x7fad92c79dc0(2000), shield 0x7fad92c34370(2001)
    27/07/2013 11:03:41.701 WindowServer[119]: handle_will_sleep_auth_and_shield_windows: releasing authw 0x7fad92c79dc0(2000), shield 0x7fad92c34370(2001), lock state 3
    27/07/2013 11:03:41.702 WindowServer[119]: handle_will_sleep_auth_and_shield_windows: err 0x0
    27/07/2013 11:03:41.704 WindowServer[119]: Created shield window 0xb4 for display 0x003f003d
    27/07/2013 11:03:41.704 WindowServer[119]: handle_will_sleep_auth_and_shield_windows: releasing authw 0x7fad92c79dc0(2002), shield 0x7fad92c34370(2001), lock state 3
    27/07/2013 11:03:41.704 WindowServer[119]: handle_will_sleep_auth_and_shield_windows: err 0x0
    27/07/2013 11:03:45.186 com.apple.launchd.peruser.502[163]: (com.akamai.client.plist[740]) Bug: 12E55: launchd + 95444 [7DCC9489-2DF5-3807-83FA-EF5666EE8078]: 0xd
    27/07/2013 11:03:45.208 com.apple.launchd.peruser.502[163]: (com.akamai.client.plist) Throttling respawn: Will start in 10 seconds
    27/07/2013 11:03:52.117 WindowServer[119]: CGXSetWindowBackgroundBlurRadius: Invalid window 0xffffffff
    27/07/2013 11:03:52.118 loginwindow[43]: find_shared_window: WID -1
    27/07/2013 11:03:52.118 loginwindow[43]: CGSGetWindowTags: Invalid window 0xffffffff
    27/07/2013 11:03:52.118 loginwindow[43]: find_shared_window: WID -1
    27/07/2013 11:03:52.118 loginwindow[43]: CGSSetWindowTags: Invalid window 0xffffffff
    27/07/2013 11:03:53.763 WindowServer[119]: Created shield window 0xba for display 0x04272d40
    27/07/2013 11:03:53.763 WindowServer[119]: device_generate_desktop_screenshot: authw 0x7fad92c87490(2000), shield 0x7fad92e6eef0(2001)
    27/07/2013 11:03:53.838 WindowServer[119]: device_generate_lock_screen_screenshot: authw 0x7fad92c87490(2000), shield 0x7fad92e6eef0(2001)
    27/07/2013 11:03:53.880 WindowServer[119]: handle_will_sleep_auth_and_shield_windows: releasing authw 0x7fad92c87490(2000), shield 0x7fad92e6eef0(2001), lock state 3
    27/07/2013 11:03:53.880 WindowServer[119]: handle_will_sleep_auth_and_shield_windows: err 0x0
    27/07/2013 11:03:53.883 WindowServer[119]: Created shield window 0xbb for display 0x003f003d
    27/07/2013 11:03:53.883 WindowServer[119]: handle_will_sleep_auth_and_shield_windows: releasing authw 0x7fad92c87490(2002), shield 0x7fad92e6eef0(2001), lock state 3
    27/07/2013 11:03:53.883 WindowServer[119]: handle_will_sleep_auth_and_shield_windows: err 0x0
    27/07/2013 11:03:55.209 com.apple.launchd.peruser.502[163]: (com.akamai.client.plist[742]) Bug: 12E55: launchd + 95444 [7DCC9489-2DF5-3807-83FA-EF5666EE8078]: 0xd
    27/07/2013 11:03:55.252 com.apple.launchd.peruser.502[163]: (com.akamai.client.plist) Throttling respawn: Will start in 10 seconds
    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.

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