I'm not familiar with PowerPC but I have two in my hardware repair class that need to be fixed. Both iMac's are G5 17" 2GHz 1gb of RAM 160gb HDD The first Mac on Startup you get the usual Apple chime then the white screen apears with the Apple logo. From there nothing. Any suggestions? Where could I find an OS disc to try and reinstall the OS? Could it be a failing hard drive? The second Mac on Startup you get the Apple chime then greyish screen with folder appears. The folder has a question mark on it a few seconds later the iMac shutdown. Any types on how to get OS X running on either machine or perhaps get linux is much appreciated.