What do ido if My iMac (intel) starts but the screen remains dark.

Reset the SMC > Intel-based Macs: Resetting the System Management Controller (SMC)
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
Reset the PRAM > Resetting your Mac's PRAM and NVRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Try booting into Safe Mode > Mac OS X: Starting up in Safe Mode
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
Or if you have installed new RAM, try reinstalling it or the iMac's original RAM making sure that the modules are fully seated in the slots.
Then if it won't light, seek sercice from your Local Apple Authorized Service Provider or Apple Store. > Apple - Support - iMac - Service FAQ

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I start my I mac 21.5 inch led 16:9 widescreen computer but the screen is black, I hear it starting but the screen still black. and the screen is black, I hear it running but till the screen black

I start my I mac 21.5 inch led 16:9 widescreen computer but the screen is black, I hear it starting but the screen still black. and the screen is black, I hear it running but till the screen black

Try a safe boot.
     Shutdown your machine. Hold down the shift key. Poweron. Wait awhile; wait awhile while you harddrive
     is being checked.
     http://support.apple.com/kb/ht1455
Report back results.

I went to use my iPhone 5 (I had used it just minutes before) and it wouldn't work. It was about half charged and seems to have shut itself off. I tried charging it and turning it on but the screen remains completely black. What happened?

I went to use my iPhone 5 (I had used it just minutes before) and it wouldn't work. It was about half charged and seems to have shut itself off. I tried charging it and turning it on but the screen remains completely black. What happened?

Try resetting. Hold the sleep wake button (on the top edge), and the home button (round button on the front with the white square) at the same time for 10-15 seconds. If you see the apple logo, let go. Your phone should restart. If not?
Make a Genius Bar Reservation (or cancel an existing reservation)
http://www.apple.com/retail/geniusbar/
Sign in using your Apple ID

Our brand new quad core imac will not start up. We hear a drive and fan noise but the screen remains black. Any suggestions?

The computer shut down on its own while we were gone and will not start up again. When we press the power button we hear drive and fan noises but no chime and the screen remains black. Any suggestions?

A pretty common thing for computers that have been shipped is a RAM chip becoming dislodged just enough to cause what you are describing. Try re-seating your RAM chips. Basically just pull them out and push them back in. Take a look at this article if you need some direction on this: http://support.apple.com/kb/HT1423

I have a Mac Book Pro 17 which starts but the screen is too dark to see. I have an external monitor connected but no signal. I need help. Thanks.

I have Mac Book Pro 17 which starts but the display is too dark to see. I have separate display connected, but no signal to it. I need help. Thanks.

The tv is a extended display on your mac like a second moitor you want to mirror them (same thing on both)
This should help you

HT3964 My MacBook Pro will not boot up. The screen remains dark although the the comput makes the characteristic start up sound. The sleep light is showing.

MY MacBook Pro will not boot upThe screen is dark, but the sleep light is on and it makes the characteristic start up sound.What is wrong?

There is always the forum for MBP
MacBook Pro
https://discussions.apple.com/community/notebooks/macbook_pro
https://discussions.apple.com/community/mac_os?view=discussions
http://www.apple.com/support/macbookpro

My second gen iPod touch has a blank screen, and won't turn on or charge in an AC outlet. When plugged into iTunes, it is completely recognized and synced, but the screen remains blank and off. What can I do?

Hello.
I recently woke up this morning to use my iPod Touch (2nd Gen) to find that it was completely unresponsive to both buttons and would not turn on. I had been using it the night before and had not charged it. Thinking the battery was drained, I plugged it into a wall outlet for two hours, and still no sign of life on the iPod. Plugging it into the computer, it immediately showed up in iTunes and synced normally, and even indicated it had nearly a full charge. Still, however, the screen showed nothing. I checked the lock and home buttons to see if it was stuck, but it was not. Does anyone have an idea of what this is? Do I need to get my iPod repaired? Any help would be appreciated.
I am running iOS 4.1, and am out of warranty coverage.
Thanks,
- Justin

1; Do a hard rest by holding the buttons at least 15 seconds. Does the Apple logo come on?
2. Hold the power button down for at least 5 seconds. Do you see the battery symbol?
If the answer is no to both questions, you most likely have a hardware issue--possible bad battery.
Basic troubleshooting steps
17" 2.2GHz i7 Quad-Core MacBook Pro  8G RAM  750G HD + OCZ Vertex 3 SSD Boot HD 
Got problems with your Apple iDevice-like iPhone, iPad or iPod touch? Try Troubleshooting 101
 In Memory of Steve Jobs 

My MacBook won't turn on. When I try, it makes electronic tones and the screen remains dark. What do I do?

This morning I found my MacBook screen was dark, no response. The power light was on, it's been plugged in and that seems to be working. I powered it down and when I hit power to turn it back on it made an electronic pattern of tones. After that...nothing. Dark screen, power light on. I'd love some advice.

Try this.
Erase and Reinstall OS X
Note: This will delete all data on the disk. Back up important files before continuing.
Erasing and then reinstalling OS X can give you a fresh start, making your computer exactly as it was whenever you received it from Apple. This can solve various problems such as corrupt system files.
Shut down the computer by going to Apple () > Shut Down…
Select Shut Down or allow the computer to shut down automatically.
Plug in the MagSafe power adapter into a power source and then connect it to your Mac if you have not already done so.
Press the Power Button to turn on the computer.
Press and hold both the R and Command (⌘) keys on the keyboard until the Recovery partition loads.
Select Disk Utility and then choose Continue.
Select your startup disk (Macintosh HD by default) from the left.
Select the Erase tab.
Choose the Format pop-up menu and choose Mac OS Extended (Journaled), enter a name for your disk, and then click Erase.
After the disk is erased, choose Disk Utility > Quit Disk Utility.
Select Reinstall OS X and then choose Continue.
Follow the instructions.
I hope I solved your question.
Austin

My computer got wet with water, the light of the charger turns on orange when it is plugged and the computer turns on but the screen remains black. What should I do?

what should I do?

Take it in for assessment:
Genius reservation http://www.apple.com/retail/geniusbar/
on-line https://getsupport.apple.com/GetproductgroupList.action

My Macbook recently started having the screen go dark while I am using it. I can see that the sleep light is still on but I can no longer see anything on the screen. How do I troubleshoot this issue?

Please help me fix this issue.

I assume this is due to the fact that system detects your internal monitor as default one, and that is there where system sends main data. In order to force system send data to the external monitor, get a mouse and physical keyboard, close MB lid, and then press any key on the external keyboard.
when you get there, go to system preferences/display, and manually move the Apple upper bar to the external monitor, then choose mirror; ultimately, set optimal resolution.

Hi! My iMac turns on, but my screen is black, what do I do? Is there a light that's dim or off? Thanks!

Hi! My iMac turns on but the screen is black. I hear it on. Is there a light dimmer?
What can I do? Thanks!!

Time to take it to the Apple Store or AASP to be professionaly diagnosed.

On iPhone 4, the screen goes dark and freezes when I start Safari

All of a sudden, today I can't access the internet via Safari on my Verizon iPhone 4. If I click on a link in an email or start Safari, the screen goes dark and freezes. What's up with this and what the fix?

Hi
Try holding sleep/wake + power button for 10 seconds, until you see the Apple Logo.
See how that goes.
Taylor

Imac intel start up problems and fan runs constantly on high

I got my Imac 17 Intel Duo Core on March 16th and 10 minutes after I started it the screen went black and a little light started flashing on the lower right. After holding the power button it finally turned off but would not boot up, just that black screen and blinking light. I was told by tech to unplug everything for a few minutes then put the plug in just the Imac, then hold the power button down while plugging it in. Well it started after that but the fan was on high constantly. This was remedied by unplugging everything for a few minutes and then starting back up normally. Now it runs in stealth mode being virtually silent. If your Imac intel is making noise it's not normal. Check out this site for noise problems.
http://docs.info.apple.com/article.html?artnum=303446
Imac 17 in Intel 1.83 ghz Intel duo core 1 gig mem Mac OS X (10.4.5)
Imac 17 in Intel 1.83 ghz Intel duo core 1 gig mem Mac OS X (10.4.5)
Imac 17 in Intel 1.83 ghz Intel duo core 1 gig mem Mac OS X (10.4.5)
Imac 17 in Intel 1.83 ghz Intel duo core 1 gig mem Mac OS X (10.4.5)

I second Dave it needs to go back to service. What I have heard happens sometime is one of the temperature sensors is either not put back on properly during reassembly or it comes of soon after. With an incorrect temperature reading that particular fan will run at full speed. You can check the fan speeds by installing iStat Pro: http://www.versiontracker.com/dyn/moreinfo/macosx/27037
George

TS1587 I tried everything, except for reinstalling the SO-DIMM memory modules. Still, my iMac will not wake up. Turning it on you can hear the fan run, but the display stays dark. Any ideas what to do? Thanks Maja

My iMac won't start up, or wake from sleep. I've tried everything, except for reinstalling the SO-DIMM memory modules. Still, my iMac will not wake up. Turning it on, you can hear the fan run, but the display stays dark. Any ideas what to do? Thanks!

Mac doesn't boot
Can you hear the fans and hard drive and see the white boot screen? Flashing question mark? The circle just runs and nothing happens? Only black screen and nothing else? These can be very helpful to diagnose the source of the problem. [1]
Flashing question mark [2]: This is usually a sign of a failed hard drive. This indicates that boot up volume can not be found.
Black screen: This is usually a sign of a failed logic board. There is no single reason for this and this may be caused by failed GPU, screen, CPU or RAM.
Circle of death/no circle/blue screen: This is usually a sign of a hard drive failure. This may NOT be a dead hard drive, just broken permissions or something
Gray screen/Apple logo/spinning gear or globe/prohibitory sign/folder with flashing question mark [3]: This could be a sign of faulty hardware but more likely a software issue, i.e. broken permissions, failed software update, etc.
[edit]
What to do
First, hold down the option key (also known as the alt key) just after you've pressed the power button. This should show all the available options to boot from, so if you have Windows installed through Bootcamp or a disk in your SuperDrive, you should be able to see them along with your OS X drive/partition. Select the OS X partition with arrow keys and press enter. Startup key combinations
If that doesn't help continue doing the steps from below:
1. SMC reset [4]. Shut down and unplug all cables including power cord for at least 30 seconds and then plug in power cord and keyboard/mouse.
2. PRAM reset [5]. Hold down option, command, P and R while booting. Start it when you hear the sound and don't let go before it reboots.
3. Safe boot [6]. Hold down shift while booting to boot into safe mode. If this works, open Disk Utility from Utilities and repair your permissions and verify the disk
4. Hardware test [7]. Insert the install disk (disk 1 in Mac which shipped with OS X 10.5.4 or earlier, disk 2 if shipped with OS X 10.5.5 or newer) and hold down "D" before the grey boot screen opens. Follow on screen instructions
5. Boot from install disk. Boot from the disk that came with your Mac. Hold C while booting. Select Disk Utility from top bar and repair permissions and verify the disk. Reboot normally and see if it works now.
6. Boot from another Mac (Firewire target disk mode). Connect the machines with a Firewire cable. Power on your Mac and press T. Select the other Mac's hard drive. Download the current OS X combo update. Run the combo update installer and select the drive that won't boot as the destination.
7. "Repair" OS X. Boot from the install disk as in point 5. and reinstall OS X. This should NOT erase any data, just replaces the system files which may have caused your booting problem. Now install the latest combo update for OS X and repair permissions on your drive with Disk Utility.
7.1. Install OS X into an external hard drive and then boot from it [8] and try to copy your data from the hard drive before proceeding. If you have done a backup recently, you don't have to do this.
8. Restore OS X from Time Machine backup. Boot from the disk that came with your Mac and choose the Time Machine restore option. This step will lose any changes made since your last backup but the system and your data will be put back to exactly as it was on that date.
8.1 Reinstall OS X. Boot from the install disk as in point 5. and select Disk Utility again. Now erase the whole hard drive and install OS X again. If you had a Time Machine backup and step 7 worked you don't have to do this.

My Imac 27' screen is shutting off for no reason. The Imac is still running but the screen is black and stay like that. Is there anyone else with the same problem, and does somebody know what is this?

I had my Imac27' for about 1 year (I bought it january 2011) , and it worked fine. But two days ago a problem started. The screen is turning black suddently, and it stay like that until I reboot it. It's not cool. The first time it happen it was hafter a very long days of video editing, I tought it was to hot. But now I just started up the Imac and 10 minutes later it happen. And now I transfer my desktop on my second screen, because the one of my Imac is constantly shutting of. What is this? Can I do something about that?

I´ve came across with the same problem and when I look out for solutions I found out that basically I had Three options
1.- Dim the brightness to the first 2 dots (that is the limit for me, anything above that shuts down again my screen)
2.- Replace an expensive part of the screen (about $900)
3.- Try with an external monitor to see if the problem was the screen or something else
What I did was to plug my flat screen to my mac with a Mini Display Port to VGA Adapter
http://store.apple.com/us/product/MB572Z/B/mini-displayport-to-vga-adapter?fnode =51
And… Problem Solved! now Im going to buy a Monitor that gonna cost me less than half of the replacement parts, my main monitor will keep siting down if i dim it above the 2 dots but at least I will have the other to work properly
So that´s that, I hope someone finds this helpful
P.S. Sorry if my english it´s not that good

What do ido if My iMac (intel) starts but the screen remains dark.

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