My MacBook Air lost mac os x. So I would like to reinstall mac os. But I can't select the disk to install mac os x. Only Recovery HD is shown and I can't select it. How can I reinstall my Mac os x.

My MacBook Air lost mac os x. So I would like to reinstall mac os. But I can't select the disk to install mac os x. Only Recovery HD is shown and I can't select it. How can I reinstall my Mac os x? Thank you!

you can download the mac os x recovery hd and run the setup to a flash drive using another mac computer running os x 10.7,(so that while installation the os x setup can varify your computer's serial no. and provide you the installation setup through internet)
or the time machine backup(if you have)
Now boot through the flash drive and follow the steps to install mac os x
here is the link to download the recovery hd for flash drive
http://support.apple.com/kb/DL1433
see this before you download
http://www.apple.com/macosx/recovery/

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