They were top end machines in there day, I have a Dual 2ghz G5, what a power horse. Looks like you just need a DVI cable and your set to go, as long as there is an OS loaded on the machine. Highest version of OS X you can install is Leopard, and thats where you will be left off, as all future updates will require intel chips. I love the Mac towers, though incredibly expensive. You will never see the inside of a computer so devoid of clutter and cables, very well thought out and it only got better with the Mac Pro. The Mac Pro has slide out trays for the hard drives that remind me of mcdonalds for some reason, looks like where they keep the mcnuggets. Being able to load 4 hard drives in under 10 seconds is a pretty fantastic.