Got a used iMac 800Mhz, trying to upgrade OS

Hey all,
Got hooked up with a used iMac 800Mhz, 256 RAM (for free :-p), and am trying to upgrade the OS to 10.4.x It won't seem to let me install the new OS, it simply tells me that I cannot install. I'm trying to use Disk Utility to format the hard drive, starting from scratch but the options to erase the drive is unavailable. I am wondering if there is some other way to re-format the HD so I can pop OS 10.4 on there.
Thanks!

Yes, that's correct. The OEM discs that come with other machines are usually machine specific and may not be able to boot or install on different Mac models. The retail version of Tiger, however, supports all Macs that can run Tiger provided the machine meets the system requirements.

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