Just wanted to note that I purchased a refurbished Powermac G5 Dual processor 2.0GHz a few weeks ago. I've run into a boot-up problem, and it seems that the logic board has gone bad. Just figured I'd share for those who might be purchasing a refurb. I'm sure Apple will fix it or replace it... I have a mac genuis apt @ my Apple store (fortunately it's just 2 mins from my house) tonight. We'll see how it goes.