Can I reinstall Mountain Lion on the same Macbook Pro?

Hey All-
New OS X user, fresh from Windows.
I have an OS X 10.8 install dvd that I made after downloading the operating system through the App Store. On windows, it is necessary to activate a new OS installation each time you reformat the drive-- but supposedly you can install it on up to 3 separate systems and infinitely on those three systems.
Is more or less the same true of OS X 10.8? Should I be able to reinstall my OS on my macbook for whatever reason however many times I desire?
Thanks!
G

If you download Mountain Lion from the App Store then you may install it on as many computers as you own. There is no need for any activation procedure.

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So I just recently purchased a 2011 Macbook Pro off of Craigslist. A friend picked it up for me, installed an extra copy of Windows 8 he had for me under my name, and made sure the OSX Mountain Lion side worked fine. Somehow, after the first time I restarted OSX it would no longer boot up, but Windows worked fine. So I booted up in the recovery partition, reformatted the OSX partition, and attempted to install Mountain Lion.
The problem is that I don't have it listed under my Apple I.D. as purchased, which makes sense because the last Macbook I bought came with Leopard. I tried to buy it on the Windows side through iTunes, but I'm not able. So my question is can I just buy Mountain Lion on someone else's Mac through the App store under my I.D., and will I then be able to reinstall Mountain Lion through the recovery partition?
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Well, you need to log in to the App Store on a Mac, using your AppleID, and purchase Mountain Lion. Then, on the konked out Mac's Recovery Partition you'll be able to sign in with the same AppleID and download the ML installer you are now eligible to use.

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when they gifted me the mountain Lion software several years ago.
Mountain Lion was introduced in July 2012. Did the people who gifted you possibly use their Apple ID for the purchase of your OS? If you used your own Apple ID, you should have simply used the one you use for all things app store. The problem with any purchase at the app store is: whatever Apple ID was used to purchase, it willl stay tied to that Apple ID forever. And, purchases from the app store are not transferable.
So, you can check with the person(s) who gifted you or spend $20 to buy it - or, if your hardware is compatible with the new OS Mavericks, you could download it and associate it with your Apple ID.
FWIW, according to the licensing agreement, the OS remains the property of Apple and you are only granted a license to run it.

I recently purchased an iMac from a friend who factory reset it, and now I can't reinstall Mountain Lion?

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Back Up (tried, nothing comes up)
Get Help Online (which is what I'm doing here)
Erase or Restore Utilities (I've checked this, it says my disks are not malfunctioning)
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tl;dr I bought a used iMac from a friend who factory reset it, and now I don't know how to reinstall Mountain Lion. What are my options?

If the system didn't ship with Mountain Lion originally and you didn't purchase Mountain Lion yourself, then you will need to purchase. A purchase by the system's original owner cannot be transferred to you.
Unless you have another system on which you have purchased Mountain Lion, you will need to first install Mac OS X 10.6.8 on the iMac, for which you'll need either the original installation disks, if the iMac came with 10.6, or a retail copy of 10.6. Install 10.6 and upgrade to at least 10.6.6, and then you can buy Mountain Lion from the Mac App Store, presuming of course that the imac can support Mountain Lion. See:
http://www.apple.com/osx/how-to-upgrade/
Regards.

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Just installing a few updates from the Mac App Store for mountain lion on my 2010 MacBook Pro, during this it made a noise and then the screen and keyboard went off, like it is off. What happened, is it off...or should I just wait it out?

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What kind of noise?
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Can I reinstall Mountain Lion on the same Macbook Pro?

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