We have recvd a donated iMac 500mHz from a parent of one of our students. It came with all the CDs for 9 and 10.0.4. The unit has been upgraded to 10.0.4 but none of the applications are present including the installer app. We have tried booting from the install CDs by hold down C on start up, but the computer gets part way up then hangs. We can't get any applications to load or even go back to 9. We have even tried installing a new Tiger DVD but the unit states it does not know which application to use to install the upgrade. We plugged in an external DVD player which works just fine.
Anybody have any ideas as to how to get out of this? We could really use this computer in the classroom.