I have the weirdest of problems. My computer, a Powermac G5, Dual 2.0Ghz, 1st Edition Released Oct 2003, will just freeze. It usually happens within 5 minutes of booting into the operating system. I am also unable to boot from the Leopard or Tiger DVD's to try and install a fresh copy of the OS as they freeze during the install. This is what I have tried so far, but to no avail : Reseating the RAM and Graphics Card Reseting the Power Management (PMU) Reseting the PRAM. Now this is the even stranger thing. I installed a copy of PowerPC Ubuntu Linux 8.04 and it works fine. No problems whatsoever . This makes me think that it is unlikely to be a hardware issue. Has anybody had the same problem?