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I had OS X Lion and Windows Vista installed on my iMac. I wanted to re-install my Lion and in the process I removed it but could not re-install it since Apple have removed it from Mac Store.

Now my Mac system has only Windows Vista. It boots with Vista only. I have to get back to Mac OS X.

  • I have a DVD of Snow Leopard. When I insert it and hold C during startup, it ejects the drive again.

  • I've tried starting into Recovery but CommandR doesn't do anything. It boots into Windows Vista.

  • I can boot into the Recovery system holding Alt, and I have the option to reinstall Lion. When I click on it, it takes me to next screen with title Install Mac OS X. But I get an alert saying Mac OS 10.7 is not available.

  • I checked Disk Utility also. There now I have Mac OS X Base System. I tried to check the restore tab but I am not able to do anything there.


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Hm. That's bad. See Reinstalling Mac OS X without original disc for a couple of ideas on how to obtain an installer for OS X. You should be able to reinstall from a OS X Lion disk image, which you'd need to download "somewhere". – slhck Jan 7 '13 at 7:47
I have updated my question, please check last two points – pankaj Jan 7 '13 at 9:03
Did you buy OS X Lion on the Mac App Store? If your Mac came with 10.6 and you didn't obtain Lion legally through the App Store, you can't restore your system. – slhck Jan 7 '13 at 11:17

You will need access to another mac, a copy of lion, & a USB HDD (Not a USB stick, as some of those cannot be made to start a mac). Follow these instructions to write Lion to the USB HDD

Backup anything you want to keep on Windows Vista as it will be deleted.

Boot from USB drive by holding down ALT on the keyboard at power-on. Reinstall Lion, making sure you use disk utility to wipe the disk before installation.

CD-ROM drives in macs of late have a very high failure rate.

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