von_krag brought to my attention that Apple has issued a recall on some of the G5 machines due to power supply problems. When the tech took the machine apart, he discovered that was indeed the problem: the supply had burned out and fried the motherboard. The motherboard can be replaced immediately, but they have to order the power supply. It is in stock; they just have to ship it in. Best scenario: I'll get my computer back by the weekend, hopefully. This is fully covered and clearly a defect in the manufacture of the G5 which Apple is taking pains to repair.