Just purchased a used iMac and need to wipe it clean.

I just purchased a 2011 24" iMac used. The previous owner did not remove anything. I would like to wipe it clean before I run Time Machine from an external drive to load my programs, data etc. What is the best way to wipe clean (completely clean) the iMac. Also, would I be better off loading all of the programs from the original CD's rather than Time Machine? I don't know if I could have picked up "stuff" over the years that I don't want brought to this newer machine.
Also, I would like to upgrade to the latest OS Lion. Should I do this first or after the wipe?
Thanks!

Did your iMac come with Lion (10.7) installed or did the seller buy that at the app store?
If the seller purchased it, then you will need the original install DVDs (Snow Leopard), either from the seller or by calling Apple and giving them your serial number. The reason: the license for any OS or app obtained at the app store is not transferable - the seller is obligated to wipe the drive and reinstall the original system. The OS is tied to the Apple ID of the purchaser forever and you will never be able to reinstall.
If it turns out yours came with Lion, the seller was supposed to call Apple and make a transfer of the OS to you.
So, the first thing to do is to figure out which OS version it came with and, if you have the install disks (Snow Leopard), then use them to wipe the drive and reinstall the original system. After that, you can purchase Lion (or Mountain Lion) at the app store using your own Apple ID.

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Hello nebpen,
"While the lamp hold out to burn, the vilest sinner may return!"
Welcome back!
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Just purchased a used iMac and need to wipe it clean.

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