I just received my brand new Mac Pro today. It's a BTO machine with the upgrade to the NVIDIA 8800GT, a second optical drive and a Mac OS X Server license. The system has Mac OS X server installed on the default 320GB drive. I decided to use the server license as a virtual machine running in Leopard client. So, I installed 2 new 500GB Seagate 7200.11 (Retail) drives in the machine, zeroed them out in prep for installing Leopard client. At this point, I pop in a freshly-purchased retail copy of the Leopard DVD and restart. When I try to boot from the DVD and install Leopard to one of the new Seagate drives, I get kernel panics - need to restart the machine. Also tried booting from the Mac OS X Server DVD and this too only caused kernel panics. The DVD's read perfectly from within Mac OS X Server and boot from hard disks is flawless. I spent an hour on the phone with a level 2 tech at Apple - Tried swapping out the RAM and moving around the DIMMS to no avail. I am at a loss to what this could be. Seems to be a hardware issue and the tech thought it was likely a problem with one of the memory risers but couldn't send replacements. Anyone else with a similar issue? This is my first Mac and it looks like this Mac Pro is going back for an exchange and I'll have to wait yet another 10-12 days for a replacement to arrive. Bummer. Am I missing something simple here? Does this seem to be a hardware issue? If anyone has any ideas before I ship this one back, please write!!!