I remember hearing issues with certain video cards and the 10.5.7 update. Is it all clear now for me to update my mac pro with 10.5.7?
-Steve

There should be no problems with any Mac system. However just to be safe use the "how to" sticky in this category I posted about how to back up your OS and quickly restore it if things go wrong for you.

OSX86 Tools (free to try) will resolve this upgrade woe (if you have it).
Look for the "repair permissions" function.

I think Beyonce said it best "lemme lemme upgrade ya"

-C