Zitat von aldous
Dem kann ich mich eigentlich auch nur anschließen. Laut Apples Webseite sollte 10.3 ja eigentlich auch noch mit dem alten iMac kompatibel sein.
siehe: http://www.apple.com/de/macosx/upgrade/requirements.html
Vor der Installation von OS X muss aber denke ich auf jeden Fall noch ein Firmwareupdate durchgeführt werden (falls es nicht schon Apple gleich bei der Reperatur für dich erledigt hat - was ich eher nicht glaube).
Ich zitiere: The first thing you need to do before installing Panther on ANY iMac is to upgrade the firmware. This is very important: on some iMacs, if you don't upgrade the firmware before initiating the Mac OS X installation, you can literally fry your iMac's logic board. Talking at MWSF this past week with another reporter, he warned me about this issue, seeing as he managed to set back his grandparents a few hundred bucks because of this problem. It seems that even simply starting up from the Mac OS X install CD, including the Panther install discs, triggers this problem: the CDs check the firmware version of the iMac, and in doing so, kills computers that don't have the latest firmware version installed. The lesson? Upgrade your firmware on any Mac before installing Mac OS X.
Luckily, I was warned about this issue beforehand, and Apple provides this handy table of the latest, required firmware updates for any Mac on which you are going to install Jaguar or Panther. And being the update-freak I am, I had already installed all the firmware updates. Firmware updated? Check.