When connecting Macbook Air to iMac, have to keep Macbook Air open in order to use the iMac as a display.

When I connect my Macbook Air to my iMac with Thunderbolt, I have to keep my Macbook Air open or else the iMac does not sense it. I've tried closing it to just use the iMac as the display, but then the iMac goes back to its regular screen. Also, I have to control everything from the MBA keyboard and touchpad- my iMac mouse and keyboard suddenly won't work. How do I fix this?

Hi there,
Apple outline the steps to do so in the link I've posted below. If you need help with any of them, just shout.
Using Mac in Clamshell
Have a nice day,
Regards,
Nathan

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<Edited By Host>

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iTunes system requirements - http://www.apple.com/itunes/download/

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Welcome to Apple Support Communities
Of course. As both have Thunderbolt, it's as simple as buying a Thunderbolt cable, connect them and press Command and F2 keys on the iMac, so the iMac will be used as an external display for the MacBook Air. If you want more information, see > http://support.apple.com/kb/PH11302

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This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. 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. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output andWi-Fi on certain iMacs. The next normal boot may also be somewhat slow.
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Using the iMac 27 screen with my macbook

Hi there,
My wife has a Macbook Air and I've just ordered a 27" iMac (Dec 2012 model). Is it possible for her to plug her Macbook Air into the iMac via thunderbolt and use the larger display for the Macbook Air (much like you would with a thunderbolt display)?
Thanks for any help you can give

Welcome to the Apple Support Communities
It depends. See > http://support.apple.com/kb/PH11302
You have ordered a Late 2012 iMac, that has got Thunderbolt ports. If your wife has got a Mid 2011 or newer MacBook Air, you can use your iMac as an external display for the MacBook Air, because the MacBook Air has got a Thunderbolt port. However, if it's an older MacBook Air, you won't be able to use it because you can't connect a MacBook Air with Mini DisplayPort into another Mac with Thunderbolt to be used as a display.
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When connecting Macbook Air to iMac, have to keep Macbook Air open in order to use the iMac as a display.

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