Hi, this is my first post here, so forgive me if I screw up with protocol. But what I was wondering is if anyone has any experience or advice concerning swapping out motherboards in the G4 towers? Since the 10.5 update, I decided it was time to upgrade my Sawtooth machine from the dual 500 processor to a new 1.5gHz OWC Mercury extreme (which is awesome!), but to really enjoy the eye candy, I want to pop in a new video card. From what I've been able to discern, the Sawtooth machines can't take full advantage of the cards I'm looking at, which require a gigabit ethernet machine or better, due to a revised AGP slot. So, here's the dilemma: I can buy one of these machines dirt cheap in their original factory configuration on E-Bay, but the shipping kills a lot of the allure of going that route. Since my case and all the components are perfectly fine, I had the brilliant (?) idea that I may just be able to buy a gigabit or digital audio motherboard and slap it in my tower. I'm completely fearless when it comes to ripping into Macs, so installation difficulties aside, does anyone know of other issues (like different power requirements, etc.) or would I be able to just unplug, plug and play? I'd be interested in hearing from anyone, particularly if you've tried this yourself.