Macbook not sure what OSX it was as I just bought this second hand the guy didnt have an install disc but that was ok for I had a Leopard disc I wanted to upgrade to anyhow I have tried numerous times to restart the PC with the Leopard disc in my DVD drive and it comes up, after I press C upon reboot, but no matter what I try I cannot get the erase and install option to ever show up i believe I have mistakenly installed Leopard over whatever OSX was here before as i am showing OSX VERSION 10.6 bt I MUST have a clean install so I have no choice but to erase he drive first This computer is 2007 so its not one of the ones affected where you need to press D to get there, although I tried that as well. I have tried setting the DVD so t will reboot from that but still no erase options at all Ive been at this many hours now and no longer know what to do I even tried going past the agree screens where I was told I would then be able to press on Disc UTILITY but I cant do that either. I dont know what else to do? Any ideas please???