Why don't you just upgrade the operating system to the latest version?
I have an iMac here at home. it's an Early 2008 with a 2.4ghz core 2 duo and 4 gigs of ram. I haven't done it yet. But I'm almost at the point of
upgrading it to 6 gigs of ram. But you need a 2gig and 4 gig ram chip to do so.
Now if you do manage to find the iso for OS X 10.6 online somewhere.
here are the steps to put it on a usb drive and install it. computers.tutsplus.com...
You should be able to upgrade without formating your drive. I know I did.
edit on 13-11-2015 by grey580 because: (no reason given)
The Above Top Secret Web site is a wholly owned social content community of AboveTopSecret.com.
This content community relies on user-generated content from our member contributors. The opinions of our members are not those of site ownership who maintains strict editorial agnosticism and simply provides a collaborative venue for free expression.