What do I do when my MacBook Air is running but the screen won't turn on?

I have had my MacBook Air less than a year and have been using it daily and have had no problems with it until this morning. I opened it and expected my login screen to appear as it usually does and the screen remained black. The computer is running and it is warm, but I cannot get the screen to come on. I have tried holding down the power button, charging it completely, etc. Help!

I'm not sure if this can help but I will explain the problem I had and the steps I took to resolve it. As with many reported MacBook Air start up problems reported, I went through all the reset steps recommended. It started when playing a video that the video froze with a repeated audio playing. After shutting down with the power button I had a hard time booting up the computer. Symptoms would be power on light on with blank screen or power light on with gray screen. My computer would not complete the boot sequence. Then I reset the computers PRAM, SMC and even tried booting in the verbose mode or single mode. Sometimes the computer would boot up and all was well until I did work that demanded more of the processor. On one of those times where I was lucky to get the computer to boot up properly, I then removed and apps or software that I installed that was always working in the background. This reduced the load on the processor.
From here I went to the "Finder" icon then selected "Applications". In "Applications" I selected "Utilities". In the upper left corner of the "Utilities" box I have two drive labels of which the first one was selected. Then the lower middle of the box I clicked on the "Repair disk Permissions" button. The computer did it's work and after a few minutes completed the repair for that drive. I then selected the second drive and did the same.
After this was done I started to use the computer heavily running videos and switching from site to site to see how the processor was doing. I also turned the computer off and on throughout the last 24 hours and had no problems with boot up. Videos are running without any problems. I also had no heat problems. I still use SmcFanControl.
I assume that the additional software I installed to run in the background was loading up the processor to the point of creating more problems. The repair disk feature had cleared up the software problem that was created and now my computer works fine. I do not think is was a hardware problem.
I hope this will help some of you. I have tried for a couple of years to find a solution to my problem and with many options it is difficult to find the right one.

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Hey! I don't know if my MacBook Air is frozen, but the screen is gray with the apple logo and an icon below turning round and round as if it's opening, but has been like that for a few days. I've switched it off and then on again several times, still the

Hey
I don't know if my mac book air is frozen, but the screen is gray with the apple logo in the middle of the gray screen, with the 'booting' icon turning round and round. I have switched it off fron both the power and power button on the computer, it goes off, when I put it on, same screen comes on again. Help Please!

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.
There are several ways to back up a Mac that is unable to boot. You need an external hard drive to hold the backup data.
a. Boot into the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.”
b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 3
If you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
Step 4
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 5
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
Step 6
Boot in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 6.
If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then reboot as usual (i.e., not in safe mode.)
If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 7
Launch Disk Utility in Recovery mode (see Step 1.) Select your startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then reboot as usual.
Step 8
Reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 9
Repeat Step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a Time Machine or other backup.
Step 10
This step applies only to older Macs (not current models) that have a logic-board ("PRAM") battery. Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a boot failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 11
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

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iPhoto ▹ Empty Trash
Do the same in other applications, such as Aperture, that have an internal Trash feature. Then restart the computer. That will temporarily free up some space.
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<Peronal Information Edited by Host>

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What do I do when my MacBook Air is running but the screen won't turn on?

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