Currently Being ModeratedApr 15, 2013 4:44 PM (in response to bgshap1)
Restart the computer with the Option key held down, click on the normal system, press Enter, and eject the DVD. If it won't start up from the normal system, restart with the Option, Command, O, and F keys held down and then issue:
Then use the computer's original disks or a retail DVD newer than it but no newer than 10.5.8 to erase it. If desired, you can connect it to another Mac with a FireWire cable, start it up with the T key held down, and erase it from there instead.
Currently Being ModeratedApr 15, 2013 4:58 PM (in response to Niel)