My MacBook Air turns off while booting

Last night I installed a heavy software on my Mac but still had 11GB free on hard drive. However while working it just crashed and stopped working. Then I turned it off and on again, but everytime it in booting when the Apple logo appears it was keep loading, even for 20 mins. So I treid to load recovery and tried all opriones. But each one does not work for different reasons.
First one is recovery from back up, as I dont have any backup so I cant use it.
Installing new OS also does not work as I does not let me to choose a drive. Keep saying Macintosh HD is locked.
Also for Disk Uitility, when I choose the Macintosh HD, it gives error while verifying the Disk and also ends up with error when repairing.
And now whenever i turn it on, it just turns of when the apple logo appears.
I have not tried safe mode yet, as I dont know how to do it.
Any idea? :/
Is there anyway to copy my files before I format the drive or any way?

The MBA bought new? Then you have warrantee.
You should be able to start while holding the Alt(option) key for the Boot menu: HDD, RecoveryDisk.
And start while holding the Shift key for the Safe mode.
Do the SMC reset:
http://support.apple.com/kb/HT3964?viewlocale=en_US&locale=en_US
Do it twice or even three times.
When you can then boot into the safe mode, do that, then shutdown and do the PRAM reset:
http://support.apple.com/kb/HT1379
When the system then still misbehaves, go the Apple, make an appointment and have them look at it.

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The "app cleaner" managed to do bad things to the file system so that it is unable to boot any longer.
This is the primary reason I always recommend that any of those so called "cleanup" apps never be used. They do more harm then good.
Try a safe boot by holding down the shifgr key when you hear the boot chime. Maybe that can fix the damage.
Let us know what happens.
Allan

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03/05/11 12:35:26 [0x0-0xd00d]. Com.skype.skype [127] WirelessAttach: IOServiceOpen error: e00002c7
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03/05/11 12:35:33 [0x0-0xd00d]. Com.skype.skype [127] WirelessAttach: IOServiceOpen error: e00002c7
03/05/11 12:35:33 [0x0-0xd00d]. Com.skype.skype [127] WirelessAttach: IOServiceOpen error: e00002c7
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03/05/11 12:43:43 helpd [160] Response failed Because Listener can not find a port for this QueryID.
03/05/11 12:43:43 helpd [160] Response failed Because Listener can not find a port for this QueryID.

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These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
This procedure is a diagnostic test. It makes no changes to your data.
Please triple-click anywhere in the line below on this page to select it:
syslog -k Sender kernel -k Message CSeq 'n Cause: -' | tail | awk '/:/{$4=""; print}' | pbcopy
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
Wait for a new line ending in a dollar sign ($) to appear below what you entered.
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Ishaan.3108 wrote:
I haven't backed up, and I have about 270 GB of important data stored that I CANNOT lose.
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Ciao.

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Try resetting your SMC:
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MacBook Pro turns off intermittently.

I have a 2008 MacBook Pro. Every few days the unit turns off while I am using it. I have to hold the start button down 4-5 seconds to restart it. Any suggestions as to the problem?
Thanks,
Rayhy1

I am also experiencing this problem. Has anyone solved it yet?
Thanks!
Here are my specs:
Model Name:          MacBook Pro
Model Identifier:          MacBookPro10,1
Processor Name:          Intel Core i7
Processor Speed:          2.6 GHz
Number of Processors:          1
Total Number of Cores:          4
L2 Cache (per Core):          256 KB
L3 Cache:          6 MB
Memory:          16 GB
Boot ROM Version:          MBP101.00EE.B02
SMC Version (system):          2.3f35

My MacBook suddenly turned off. And won't turn on

My MacBook suddenly turned off. There was a click sound and then nothing. I have tried to restart it but nothing happens. No sound no lights. It is plugged in and the power cord shows green. I have not damaged it in any way.....

Here is what to do;
1. Unplug everything from your computer.
2. Take off the bottom of your MacBook / Pro / Air. (There are usually 3 screws that are longer than the rest near the vent, remember where they go.)
3. Carefully unplug the battery from the logic board.
4. Wait 10 seconds.
5. Plug the battery back into the logic board.
6. Put the bottom cover back on.
7. Reboot the computer holding the "Option" key.
I posted this originally here. Re: My Mac randomly just turned off and now it wont turn back on, the charger light is faintly flashing green and amber?!?!

My MacBook Air turns off while booting

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