Updating os x to leopard
We want to make sure that all of the software running on the current setup is going to be compatible with Lion.
As of Lion, Apple will no longer be supporting Power PC architecture, and has removed the Rosetta emulation layer from the OS.
A lot of people have been suggesting to use an external hard drive to put the Snow Leopard installation media on.
This can be slow (eww, USB), and not everyone has a large enough external drive.
Unfortunately there is no solution which will be cheap AND easy.
If you have access to an external USB or Firewire hard drive and another computer that does have a working CD drive, you could use the other computer to clone the Leopard CD onto the external drive, and install from there. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?
If you need Java 7, upgrading to OS X 10.8 is probably the easiest route (upgrade from the Mac App Store costs .99) -- but your desktop will start looking and behaving more like a phone.In essence, any installed software that isn't an Intel or Universal binary will no longer work.One thing you might want to re-evaluate is what software is a The best way to find out if the software you are running is capable of working under Lion is to open System Information (formally System Profiler).If your machine is running Mac OS X 10.5 Leopard, you will be required to upgrade to 10.6.6 Snow Leopard in order to proceed.Now that we know the machine meets suggested system requirements, the next step is an important one.