Display suddenly goes dark

Hi everyone,
I've had my iMac for 8 months, I use it every day but not all day, I turn it on about 2 or 3 times a day for about 30-60 minutes at a time, though occasionally I will use it for longer periods at a stretch.
For the past couple weeks, the screen will suddenly go dark, like it's going to sleep. If I tap the keyboard, it wakes up, and at first I thought this was due to the display going to sleep, but I have it (both the display and the computer) set to sleep after 15 minutes, and it's happening sometimes if I only keep my hands off the keyboard of mouse for a minute. Should I take my computer into the Apple store? I didn't buy AppleCare but it's only 8 months old, and this doesn't seem like a usual problem, I couldn't find any other posts on this matter.
Thanks,
Lizzy

my Macbook (with all the latest updates) is doing this daily as well. usually when i am working on something like excel or entourage just happened again when i was in excel. touch the tracking pad and it comes right back. the darkness is like when it is going into sleep mode even though it is no where near sleep mode as i'm actively using it.

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Monitor suddenly goes dark

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I get a little blue box that says "No signal, analog"
That message comes directly from your display, not from the Mac.
Consider replacing your aging graphics card with an Apple-firmware 5770, about US$250. It works in every model Mac Pro and drivers are in 10.6.5 and later.

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While I am using my iMac, occasionally suddenly goes black. If I hit a key (usually the space bar), it comes back as if I had put it to sleep.
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Thanks for your help and information.

"Answered on another forum"
What a way to be helpful! I went through your posts and searched "display" and I did not find this mysterious answer you talk about.
I'm having the same issues on my Intel Core 2 Duo 20" iMac. if ANYONE could post a solution, I'd appreciate it.
The computer is still working correctly. It is not on sleep mode. I've press the power button and it goes to sleep, but then when I wake it up it repeats the black screen a couple of times until it finally settles on letting me work.
What is the point of user support forum if there are no moderators around to help people out? :/

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My apple thunderbolt display (which I purchased 1.5 years ago; OS 10.7.5 Mac Mini) intermittently goes dark, does not wake from sleep after clicking mouse or keyboard, but there is "bonk" sound after clicking mouse or pressing keys, so am thinking it is a hardware problem with the display. Rebooting by pressing the power button turns the screen back on, but the same phenomenon has occurred several times. Could this be a software issue, or do I need to have my display repaired? Your feedback would be appreciated.

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Long shot but...
I wonder if it's a variation of this, of which I've seen many different symptoms...
Resolution
Move the mouse or trackpad cursor over the center area of the login window so you can see the user icons. Click on the icon of the user that you would like to login as, type in the user's password, and press Return.
If the login window is configured to show only the name and password fields, type in the user's name and password into the fields, and press Return (even if you cannot see the rest of the login window).
Additional Information
This issue will not occur if the display is not sleeping when the account is logged out. Use the steps below to confirm that the account is not configured to log out automatically while the display is sleeping:
1. Open System Preferences > Security & Privacy > General. Click the padlock to unlock the preference pane and enter your admin password. Click the Advanced button at the bottom, then see if the option "Log out after N minutes of inactivity" (where N is the number of minutes) is enabled.
2. Open System Preferences > Energy Saver and configure Display Sleep to occur after the account is logged out, by dragging the slider to a number of minutes that is greater than N was set to in the previous step.
Important: If automatic log out is not needed, disable "Log out after Nminutes of inactivity" in System Preferences > Security & Privacy > General. This will also prevent the issue.
http://support.apple.com/kb/TS4135?viewlocale=en_US

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Is this failing and should be replaced?

Can you test another monitor and/or this monitor at another pc?
If the behaviour follows the monitor then it seems like it's going to die.
*** Say 'Thanks' with Kudos ***

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Yes, the light comes back after a few minutes or half an hour.
Will try take a screenshot when the display is off again as soon as I get the iMac back from the workshop.
I have decided not to spend so much money on the replacement of the display for the moment. If the light goes off more often I will buy another display (probably a non-apple-product with a better warranty) and connect it to the iMac.
As much as I love the concept of the apple products and the idea of an All-In-One computer (it's my 7th apple in 25 years), I really disliked how they treated me as a customer with a valid complain.
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Okay, admittedly I don't have your unit in my hands. But, the instant, long distance, I've never actually seen your iBook diagnosis is that the issue is caused by a damaged inverter and reed switch cable assembly, pinched as it passes through the hinge from the lower case to the display, and therefore intermittently open.
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Although a limited number of early iBook G4 models—in rare circumstances—may have been affected by the separation of a ball-grid array video chip from the logic board, that issue is limited almost completely to iBook G3 models.
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Model Identifier:          MacBook4,1
Processor Name:          Intel Core 2 Duo
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Hi, firetiger.... i have the EXACT same problem!!! i have the same Macbook aluminum unibody screen also. I have no idea how to fix it. I'm also out of warranty and i've tried everything... resetting the pram, trying to restart in safe mode, trying to boot from a cd... .NOTHING WORKS!!! i can still control brightness itself but ive never tried attaching to an external monitor. I know everything is loaded correctly... i just don't know whats wrong. If you have any ideas.. please let me know. Also, I think apple will fix the macbook pros with a similar issue for free http://support.apple.com/kb/TS2377 but i know this doesnt apply for me. hopefully they work something out because I really love that computer!!!

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Display suddenly goes dark

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