My mac book air is not shutting down from 12 hours. i can just see desktop background and a coloured disk revolving.can u plz help me.

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The best way is to refer to the installation manual for this unit.

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Assuming the MacBook has FireWire, get a firewire800 cable. PLug it into both Macs FireWire ports. Shut down MacBook, restart and hold T key = target disk mode. MacBook will appear as any other mounted external drive on your desktop. *From there, you can either manually drag files over or open Migration Assistant on the iMac and migrate user/data/ apps.

Shutting down of just display going black?
If latter, you can keep touching screen to let it know not to sleep; or go to the system controls and set "sleep" to 1 hour or longer.

To create a new folder on the desktop right-click on the mouse and select New Folder from the drop-down menu.
If you do not have a mouse connected, press the control key while clicking the desktop background, and select New Folder from the drop-down menu. The folder should appear near the area of the desktop you clicked with 'untitled folder' highlighted in light blue. You can now type a name for your new folder. Press return/enter when you are done naming your folder.

power cycle your Mac. Shut down and restart should work! Your desktop should show the hard drive!

Unplug it, remove the battery. Once it shuts down, replace the battery, plug it back in and start it up.

To have a try like this,put off the power connect wire,and took off the laptop battery for Makbook,it must be shutter down.Then restart it again! Good luck.

Insert your installation disk that came with the mac and hold the "c" key while turning it on, this will force it to boot from the cd drive. Choose your language from the selection screen, I'm going to assume English, and choose Utilities --> Disk Utility from the drop-down menu on the top of the screen to open the Application. From there select the Mac partition of your Hard Drive on the left which should be called "Macintosh HD if you did not change it. In the "First Aid" tab, you will see two buttons on the bottom right hand corner of the window, "Verify Disk" and "Repair Disk." First Verify the disk, then Repair it, if it does not work at that point you will likely need to format your Hard Drive. If you do not want to lose any work and can't retrieve it any other way; get an external laptop HD case (specs are 2.5 inch by standard 9 mm, but could hold thicker like the 12 mm Western Digital Blue Caviar line above 500 GB) from Radioshack or similar, it should run you about $25. Transfer or backup any data you want to keep to your desktop, external or similar from there and format the disk and reinstall Mac OS. Cheers.

Hello, it semms that you have a "permission" issue, or that you are accesing another account on the computer without noticing it. Please repair disk and permissions from the disk utility on your install DVD:

- Insert install DVD
- reboot the mac holding the C key
- choose english
- Go to the utilities menu and choose Disk Utility
- In the disk utility window, SOS tab, select your drive, and hit repair disk and repair permissions
- reboot

Also check that you are accessing the account that you want and not another one: log out, and log in...