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If you are sure you bought it brand new in stores between 2009-2010, it was probably what Wikipedia calls the Early 2009 model.
Even if all of the previous deductions were incorrect, as long as you are 100% certain that the i Mac has an aluminum housing (i.e., the outside is gray, and not white), then even in the worst-case scenario in which your i Mac is from Mid 2007, you are guaranteed to be able to install OS X 9 (Mavericks).
After it restarts, your Mac will guide you through the installation process.
Although the guided instructions are usually all you’ll need for a successful installation, we’re going to take a little detour and use Apple’s Disk Utility to make sure that your hard drive is up to snuff before you install your new Leopard OS.
The Upgrade option is the most common method of installing OS X 10.5 Leopard.
It effectively preserves all of your user data, network settings, and account information, while it installs OS X 10.5 Leopard over your existing operating system.
Upgrading is a great choice for most users, as long as their current version of OS X is performing without any major issues.
Though it goes against Apple tradition, Apple has (thankfully) released 10.9 for free as long as you have the system requirements to run 10.8; a simple Google search will help you determine that.…do you mean that the i Mac was bought brand new (i.e., the newest model available in stores in the 2009-2010 time frame), or did you potentially buy an older model (i.e., from 2007-2008) in the 2009-2010 time frame?Because you have OS X 10.5.8 (Leopard) currently, and assuming that you never your OS X, you can narrow down which i Mac model you have.Apple also sells Lion and Mountain Lion from the web store if you need an upgrade that isn't the latest and greatest.Your first practical step is to go to and find in support the article on indentifying your Mac to determine the hardware capabilities before spending any time or money on incompatible upgrades.