(Okay, maybe not quite explode, but it put out a really cool light show at the Genius Bar!) One of our users said his G5 wouldn't boot up. Sure enough, pressing the power button on the front would result in a "click" and then nothing. Power supply is bad, I figure. The thing has Apple Care, so I take it into the Apple Store and the Genius is taking a look at it. He decides to plug it in. He didn't even have a chance to hit the power button, when there's a bright flash from inside the case and a loud "POP!" Everyone at the Genius Bar turns and looks. He pauses and then says "Okay, now we're replacing the power supply, processors, and motherboard." I was highly amused! So I get a call a few days later and they say that the liquid coolant had leaked out, so they'd also need to replace the cover for the power supply, which was on order. To make a long story short, after several phone calls and 2 weeks of waiting for parts, they gave me "the bad news and the good news": basically they were replacing the machine with a Mac Pro! Dual 3GHz Xeon, 2GB RAM, dual Super Drives, and a much better graphics card. The Apple Care really paid off on this one! I checked the Apple forums and apparently most of the Apple Stores are starting to do this with the defective liquid-cooled G5s. Has anyone else had this happen to them recently?