Kernel Panic solved
I HAD numerous Kernel Panics on my MAC; the Apple store Carlsbad tried to fix it by replacing one of my factory NVidia graphics cards.
It did not work BUT what did is when they replaced my processor fan.
I have been running now for 2 weeks with a cool machine and NO Kernel Panics.
I am so happy.
Thank you Apple Carlsbad!!!!!
Mac Pro, Mac OS X (10.7.4)