Apple have taken a new approach for installing Snow Leopard. Sometimes it is backfiring, which is disconcerting. I don't have my claws on Snow Leopard yet. It's in the mail. But here is my POV so far, as I posted at MacDailyNews:
From every reviewer's point of view, the new approach Apple is taking is to lead users to install ON TOP OF their current OS installation. For ordinary users, there isn't a clear method for making a clean installation via the DVD.Conclusions:
There are a couple problems with this approach:
A) What if the current OS installation is corrupt, or that volume is damaged? It most likely means problems after the new OS installation.
B) What if Apple's list of NOT-compatible applications and extensions is incorrect? Well, it IS incorrect! The result has been that some good applications are sequestered by the installer and some bad applications are left in place. The worst examples are bad .KEXT files left in the system that are causing the Sit-And-Spin problem for some users after the installation has rebooted.
How is Apple supposed to solve both these problems?
A) Test and repair both installation volume. The repairs provided by fsck/Disk Utility are NOT adequate for this task.
B) Apple has to have tested EVERY application and .KEXT file that runs in Leopard. (Apple are not supporting installation over Tiger, although it has been found to usually work). Good luck with that one. There is no registry at Apple for applications. Apple literally has no way of knowing all the software available for Mac. It's not going to happen.
Therefore, this new approach is going to have problems now and in the future.
Meanwhile, I can verify that a CLEAN INSTALL is the very very best way to go in all cases. It has solved major problems for me many times. Sorry Apple. Nice idea! But not practical or supportable.
If you have the time and stamina, I suggest a CLEAN INSTALL of Snow Leopard. Performing an install over Leopard (or Tiger) and running into a problem is rare. No need to blow the problem out of proportion. But the problems are happening.
Therefore, of course I am going to suggest the #1 Rule Of Computing: MAKE A BACKUP of your ENTIRE boot drive before performing ANY installation of Snow Leopard. Carbon Copy Cloner is free to use these days. Get to it! You will not regret it.