Disk ejecting when trying to format
I inherited an older iMac that dates back to 2004 which will not boot up correctly. When I tried to format it with OS X 10.4 (PPC), the disk ejects while holding 'C'. If I press/hold alt/opt during boot-up, it only shows me the Macintosh HD and not the optical drive. Could it be that the optical drive is bad? ...or might this be happening if it's an Intel that I mistook for a PPC?
iMac, Mac OS X (10.4.11)