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I've got a 2006 Core Duo 1.8Ghz running 10.4. I also have a not-for-resale copy of 10.6. when I try the upgrade, it says I must upgrade to 10.5 first. This doesn't make sense as my computer is eligible for 10.6. Any ideas on what to do here?
The Disc you have is what's called also a Drop-in upgrade Disc, issued to people that bought Macs with 10.5.x installed a month or so before 10.6 was released, Apple issued them for free.
You need the Retail Install Disc...
Snow Leopard/10.6.x Requirements...
General requirements
* Mac computer with an Intel processor
* 1GB of memory (I say 4GB at least, more if you can afford it)
* 5GB of available disk space (I say 30GB at least)
* DVD drive for installation
* Some features require a compatible Internet service provider; fees may apply.
* Some features require Apple’s MobileMe service; fees and terms apply.
Which apps work with Mac OS X 10.6?...
http://snowleopard.wikidot.com/
Call Apple Sales...in the US: 1-800-MY-APPLE. Or Support... 1-800-275-2273
Other countries...
http://support.apple.com/kb/HE57
It looks like they might still have it...
http://store.apple.com/us/product/MC573Z/A?fnode=MTY1NDAzOA
If it's a core Duo & not a Core2Duo, then it'll only run in 32 bit mode.
Before embarking on a major OS upgrade, it would be wise, advisable and very prudent if you backup your current system to an external connected and Mac formatted Flash drive OR externally connected USB or FireWire 800 Mac OS extended formatted hard drive. Then, purchase, install and use a data cloning app, like CarbonCopyCloner or SuperDuper (since your current OS X version is 10.4.11, SuperDuper appears to be your only option, now) to make an exact and bootable copy (clone) of your entire Mac's internal hard drive. This step is really needed in case something goes wrong with the install of the new OS, you have a very easy way/procedure to return your Mac to its former working state.
Upgrade to 10.6
