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It runs on the OSx operating system. It would not be an iMac if it ran on Windows or any other system.
NO!
The G5 came with the OS 9 operating system and had a Power PC processor. It was the last edition of Mac OS. The iMac switched to the OSx operating system with the next iMac. There was an education only model G5 that did ship with OSx Panther.
It depends on your operating system.
Turn it on by pushing the power button on the back left bottom of the iMac.
Intel microprocessor-based computer running the Apple Macintosh operating system; Intel-Macintosh computer; IMac computer; iMac computer
There is only one operating system specifically for the Mac that being Mac OS X. The current version of Mac OS X is 10.7 which is also known as Lion. Macs can run other operating systems such as Windows or Linux if required.
iMac, Mac Mini, Macbooks, and Hackintoshes.
The term iMac refers to the design of the computer. The latest operating system for the iMac was released in September of this year 2012. It is called Mountain Lion. It is OSx version 10.8.1.
Early ones has Mac OS9 and later ones came with OSx.
OSx Mountain Lion which will be released July 2005.
MS Picture It is not available for Mac OS Leopard. To use it on an iMac you will need to install and run the Windows operating system.