-
All replies
-
Helpful answers
-
Nov 23, 2012 11:54 AM in response to richiewalkerby John Galt,You must be using the original grey OS X discs that shipped with the machine or a retail OS X installation disc.
If you are attempting to use a grey OS X disc that did not ship with your iMac, it will not work since they are machine-specific.
Other than those reasons, it is possible the disc is dirty or scratched, or your optical drive has simply failed. In the latter event you need to replace it or use an external optical disc drive, or boot your iMac in FireWire Target Disk Mode and use another Mac to read the disc.