Can't boot open firmware..

Hi,

I'm trying to install Max OS X 10.5 on my

iMac 5,1
Intel Core 2 Duo
2,16 GHz
RAM: 1GB
667MHz


It obviously doesn't work right away with the Leopard installer, because I dont have the requiered 800 or so MHz.

So I tried to do this right here:

but when I press CMD-OPT-O-F at the chime, nothing happens.. Is that because I have an Intel system?

If so, is there any other way to install Leopard on my iMac? And yes, I've seen this Guide ( http://forums.macrumors.com/showthread.php?t=371302 ), but that looks incredibly difficult.. Is there an easy way like the CMD-OPT-O-F method?

Thx a lot!
Admirator

 

Well I did try to install it with the Leopad installer and it said "This cant be installed on this" or so..

And when I look at the system preferences, it says that I have only 667MHz.

Sooo.. any help?

 

This is what I bought:
http://www.ebay.de/itm/250934763332?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

And on there (it's German), it says that it is compatible with:

Sooo.. that's not true then?

 

But right now, I only have Mac OS X 10.4 installed on my iMac, SnowLeopard ist 10.6 right?
Can I just make that jump from 10.4 to 10.6 without installing 10.5 Leopard first?

And is my iMac compatible with SnowLeopard?

 

Thanks a lot! So, when buying SnowLeopard, what should I look out for so that I dont end up with another model-specific disk?

 

Yes, but you see I only find SnowLeopard Upgrades on Amazon/Apple, that require a 10.5 Leopard OS to be installed... like this one for example: http://store.apple.com/us/product/MC573Z/A?fnode=MTY1NDAzOA

But as you know, I have 10.4 installed, and you said I could make the jump from 10.4 to 10.6 directly..

Can you show me a SnowLeopard CD on the Apple-Store or Amazon that I can use for this purpose?