I now had a problem with an Asus A8N-E/FM, Socket 939, nForce 4. I had a new unformatted 500GB SATA HD conntected. During booting the Leopard DVD stopped at some kind of NTFS driver. Tried several times, wasn't working. I booted from Myzar 10.4.6, this works. I'm now formatting the HD.

Hey lllsondowlll,
Maybe I can help you. I've got a similiar problem: My ATA-hdd can't be detected. So I can't install Leopard.
Look here: http://osx.kbot.de/comments.php?DiscussionID=24&page=1#Item_15
I'm trying to inject the kext with MagicISO. I know your problem with the bootability. You have to open MagicISO, open your image and save the Boot-Information (left to the "Bootable"-logo). Then you'll edit your image, load the Boot-File into it (there's a button next to the Bootable"-logo again) and save it (it could take for a while).
That's my way. In this moment, I'm burning the new iso, but I don't know if it'll work, because the new image is a little bit smaller than the old one. Try to do the same. Good luck!

Thank you so much! finally a straight answer. Let me know if it works, if it does then I will do it. But I prefer to wait for confirmation before I go wasting disks. Please let me know if it works and thanks again!

Oh, I'm sorry. I tried it, but the "Boot from CD" freezes. But I'm sure it's the right direction we have to follow. Leopard will be ours!

Test the following: Boot from the original disc, then press F8 to stop the boot process. Eject the original disc and change it which your patched one, then continue booting. But I'm not sure if MagicISO could save an ISO containing HFS+ data correctly. UltraISO 8.x only saves the Joliet part.

And that's the problem! I think, there's no way to "just edit the image and save it again".
But I'll stay tuned and trying!

If you have already an OSx86 system running, maybe this could work: Insert the Install DVD and open Disk Utility. Select the DVD and create an .dmg image from it, but it must be readable/writeable. Now you should be able to insert new kexts, but the permissions must be set correctly. After this you can burn the DVD again, use a RW disc for this. But I don't know if it also restores the bootloader (this is no HFS+ format), in that case you have to use the switch-disc method.

Something different: Are you using a combines Windows-MacOS-HD? I can't recommend this. If you use Disk Utility one on a HD, Windows has problems to manage them. Partition Magic 8 marks the whole harddisk as 'DEFECTIVE', with a big yellow bar which you can't move, delete or anything. The only way to make this HD useable again is to delete the MBR - and in that case you will destroy any data on the HD. Better use a single HD for MacOS and Windows, ist also easier 'cause you can use the Windows XP/Vista bootselector to switch between the OS.

I don't have a running OSx86-System. But maybe I can do this "live"?

I think my english ends here. :-) I'll "whisper", so nobody will ask, what (f..fu...funny) laguage it is ;-)

[whisper]
Naquaada, ich hab nur eine Festplatte. Vielleicht ist auch genau das das Problem, wieso sie nicht angezeigt wird. Kann das sein? Ich glaube ich werde mir noch irgendwo eine zweite billig erstehen, dann warscheinlich am besten SATA oder? So kann ich doch ohne Problem dualboot'ig Mac OS installieren, meinst du nicht?
[/whisper]

Okay, let's go back to the good, old english language. ;-)

I made an installation guide, look here:

http://osx.kbot.de/comments.php?DiscussionID=33&page=1

my mail address is also visible now.

Alright. Thanks naquaada.