Even though this is a very old thrread, I am new to OS X, and wanted to aska question about the side effect of upgrading from Tiger to Leopard.Plus when you get leopard do not use the standard upgrade path of installing. Use the Archive & Install way of initially installing Leopard. Trust me it will prevent a lot of upgrade headaches.
Once Leopard is running do not open any programs yet. Just open you favorite browser and down load the 10.5.1 Update and update it. When it reboots download the 10.5.6 Combo Update and it will take you straight to the latest 10.5.6 version of Leopard. Be patient because there will be a big security update inside the combo that will reboot the Mac twice, this is normal. Once 10.5.6 is all done then use Software Update to get the remaining updates.
Lastly get the free program AppFresh so it will find & point to all the program updates you applications will need to function in Leopard.
Note: One word of warning is Application Enhancer hackies from Tiger broke the Leopard install. So junk all the Application Enhancer plugins before upgrading to Leopard.
Good Luck.
An Archive & Install should keep all your apps as you had them before the upgrade to Leopard. The Archive & Install, in a sense, bypasses the existing system, and installs a fresh set of system software. You will see when you choose that option, that you also have the choice to save your files and data - and you should make sure that sub-choice is selected.
You shouldn't lose any apps - although occasionally some will need to be reinstalled from your original disks. Those could be pro-level apps, such as Adobe PhotoShop, or maybe something like ProTools. Your experience may vary, but most apps will be no problem with an Archive & Install.
You may find some of your apps that need to be upgraded. You should check on all that you have for possible updates to support Leopard. And finally, some apps that you are using now may not work with Leopard. A common one is (again) Adobe Photoshop CS1, or older versions. The one prior to CS is PhotoShop 7 - which will not work - no fix to get it to work with Leopard.
So, there you are - it depends on what you have now.
If your "system installer for leopard" is a grey disc, then it ain't gonna work.
Machine Name: iMac G5
Machine Model: PowerMac12,1
CPU Type: PowerPC G5 (3.1)
Number Of CPUs: 1
CPU Speed: 2.1 GHz
L2 Cache (per CPU): 512 KB
Memory: 1.5 GB
Bus Speed: 700 MHz
Boot ROM Version: 5.2.6f1
Is it possible for me to upgrade to a newer software version like Mac OS X 10.6? I have tried downloading several programs such as skype and itunes. unfortunately it would not let me instal them because my Mac is not up to date. if there is a way to update it please help me i really need it