IMac screen is black when I turn it on

My iMac screen is black when I turn it on? Any ideas on what is wrong?

Hi,
I was working with my iMac, the screen was suddenly frozen, then I tried to restart it manually, after turing it on again,
It started beebing (alarm-like) and the screen is black. What do I do now?

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Screen stays black when I turn my iBook on, no response. HELP

I really hope someone can help me with this cause the laptop in question belongs to someone else and I'll be in a tough spot if I don't fix this...
So I've been borrowing this G4 iBook. I've installed some software, including some "whois" programs from the internet. I've also been downloading torrents via Transmission. Anyway, this is what happened:
I was downloading a torrent, and I had Safari open. I began to transfer a movie to the Apple-TV system I have when things started running slowly--so I went to the energy savings panel and optimized the processor for highest performance. Things kept running slowly so I began to quit programs. Finally I had only the Apple-TV transfer open but the Finder wasn't responding (rainbow wheel).
I tried to relaunch the Finder by force-quitting but no response. I then tried to restart, no response. So finally I held down the power button to shut the computer off. Now when I turn it on I hear the start up sound but the screen remains black. I think the keys are unresponsive too cause I tried pressing the power button and pressing 'return' to see if it would restart or shutdown. Nothing. I mentioned that I've been downloading some software and torrents for the off-chance that I have a virus. I have a Norton Antivirus CD if I need it. I don't know what to do though.
I'd really appreciate some help here. It would save me the embarrassment of having to take the laptop to get repaired.

Very Important, how much Free Space is on your Hard Drive first of all? Click on the Macintosh HD on the Desktop, then do a Get Info on it.
See if this works...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)

My macbook pro doesn't turn on. The battery is charged but the screen stays black when I press the power button. Anybody has a solution for me please?

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Try a #1 SMC Reset and see the Apple links, if that doesn't work make a appointment for a evaluation.
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Claire, please post your machine specs as requested. There are some variants of the MBP with specific hardware issues. Example: the older "silver key" MBPs with 2.2Ghz and faster processors can have a defective video chipset that produces a black screen or distorted video. That problem is covered under an Apple program that will fix this at no cost to you if you computer is that model.
Do "About this Mac" from your Apple menu and, in the resulting window, click the "More Info..." button. That launches System Profiler for you. The first screen looks like this:
The second line, "Model Identifier" (or "Machine Model" if you are running OS10.4) precisely identifies your MBP variant. Post that, and include it in your equipment info in your profile for future posts. That means people don't have to ask, and you get faster help that is targeted to your specific model. Saves everybody a bunch of keystrokes and you get better advice.

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It's possible you've got a 'hot corner' set up. If you have and move the mouse to a certain corner of the screen it'll do as you describe. Have a look in System Preferences>Mission Control, bottom left of the window click on the 'Hot Corners' button and see if there is anything in there.

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Apple guarantees their work, take it back.

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Howdy OatsaMae,
It sounds like your screen is flashing unexpectedly on you for some reason. I would recommend this section from the following article to help you get that resolved, named:
Apple computers: Troubleshooting issues with video on internal or external displays
Reset the system
You can reset the Mac's parameter RAM and SMC.
Reset the resolution
Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
Choose Displays from the View menu to open the preferences pane.
Select any resolution and refresh rate that your display supports.
Restart your computer.
Thank you for using Apple Support Communities.
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Hi,
There seems to be a serious issue with screen brightness on the 24" iMac. About 6 days ago I bought a 24" iMac (2.66 Mhz model w/4 GB RAM + 640HD).
Out of the box it had Leopard 10.5.5 installed; there were several problems.
1. Screen brightness was way too BRIGHT. Display preferences would not pull brightness down. At least not down far enough so that the screen could be viewed without extreme discomfort. Plus add insult to injury a reboot would reset the preferences to maximum brightness. NOTE: An upgrade to 10.6.1 did NOT fix the issue.
2. Viewing a browser page via either Safari or Firefox (latest versions of each) was not good. A vertical scrolling would be jumpy and appear pixelated. Upgrade to 10.6.1 seemed to fix most of the issue in Safari, but Firefox was still not working properly. The issue appeared like a horizontal "ripple" in about the bottom 2/3 of the browser window. The effect did NOT extend outside of browser window. Changing screen resolutions did not work.
3. Connecting a USB Logitech head set caused issues with Sound preferences.
If the head set was connected during startup the machine would recognize them as main sound. The internals speakers did NOT appear in the Sound preferences. as an optional choice. Removing USB headset and reboot would return the internal speakers to the Sound preferences. Plugging in headseat would work for a while. We could repeat and same problem would occur.
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Returned with the iMac to the Apple store. Bottom line, after nearly three hours; the Apple technician, and everyone could see what we were talking about.
Regarding the screen brightness. Nothing they could do about it. They stated that "not too many people have complained about it, to their knowledge." They stated that the electronics in the "florescent" panel could not be turned down the same way. TRANSLATION: The programers at Apple let this one slip past them. As a customer (software programmer & network analyst) I expected a bit more of an intelligent answer.
However.
Examining the 20" model I noticed that we could turn down the screen brightness - at least to a level that my wife and I could live with. PLUS the settings remained after a restart. Something that was NOT happening with the 24" model.
So - we exchanged the 24" for a 20". Frankly we are a LOT happier. The Safari/Firefox issue is still carried over to the 20". However it is not nearly so noticable on the smaller screen.
Plus the USB headset did not cause the same Sound Preference issues.
So - Thanks for the speedy return/exchange of the iMac. But someone needs to look at this from the programming side of things.

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Hey 11doski,
Thanks for the question. After reviewing your post, it sounds like the display has a dark screen. I would recommend that you read this article, it may be able to help you resolve or isolate the issue.
iPhone: Hardware troubleshooting
Display has no backlight or dark screen
Toggle the ringer switch to see if the unit vibrates. If it does, it could be that iPhone is getting power, but is not displaying any image.
Try turning iPhone off and then on again.
While connected to the iPhone charger, try to reset the iPhone.
If the low-battery screen appears, charge the iPhone.
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Error 1600, 1601, 1602: Try the following steps to resolve this error:
Ensure proper USB isolation troubleshooting has been performed, and test with a known-good cable.
Follow the steps listed for Error 1604.
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IMac screen is black when I turn it on

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