To upgrade beyond Mac OS X 10.4 (Tiger) you will need to purchase Mac OS X 10.5 (Leopard). If the iMac has an Intel processor you can jump straight to Mac OS X 10.6 (Snow Leopard) but if it has the older G4 or G5 processor then 10.5 will be as far as it can go.
The upgrade will cost $19.99 and can be downloaded at the Apple Store online.
The DDR2 533 RAM is in fact compatible with an iMac. It is very advisable to upgrade an iMac with a DDR2 533 RAM as iMacs are really not known for their RAM.
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Yes, you can upgrade to Lion from any iMac that uses the Intel processor. But the newest OS is Mountain Lion.
It runs on the OSx operating system. It would not be an iMac if it ran on Windows or any other system.
To add an additional 1GB to an iMac to give it 2GB of RAM should not cost more than £15 (US $20). The Intel based iMacs are very easy to upgrade via the access door on the bottom. (See links below)
Days of Our Lives - 1965 1-10411 was released on: USA: 29 September 2006 Belgium: 9 March 2011
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.
One Life to Live - 1968 Thrill Me to the Marrow 1-10411 was released on: USA: 6 April 2009
Intel microprocessor-based computer running the Apple Macintosh operating system; Intel-Macintosh computer; IMac computer; iMac computer
Turn it on by pushing the power button on the back left bottom of the iMac.
NO!