I have an Imac 17" intel core duo 1.86 Gz, 512Mb ram. I put a new Hd because the other one died. When I go to disk utility I can see the HD. I formatted it as Macintosh HD and mounted it, however when i try to intall the OS using the original disks, it says "Software can't be installed on this computer". When i click on startup disk, the only thing i see there is the Mac OS DVD and Network start up, but no Hd at all. Some say maybe i don't have the original install disks but someone at the mac store said that the HD is not mounting and thats why the software can't be installed. Holding the Option Key at startup, only shows the Mac OS DVD. Am confuse why i can see the HD in disk Utility but in startup disk there is nothing. Thanks for your help!