I'm writing this from work after hours because my iMac G5 is down, awaiting its third logic board and second power supply. Why? Because something is sizzling and smoking in the machine. I've already have one logic board fail. What is the problem with these G5s? Certainly, this is not normal, but is it normal for Apple to keep putting faulty parts in my computer? I notice my AppleCare terms say that they have the right to repair my machine with second-hand parts (what a great value). Is this the problem? My guess is probably. I even asked if I could just get a replacement or refund, but the AppleCare people refuse and even refused to let me speak to a supervisor. Their solution is to keep getting the machine repaired, no matter how many times it fails. I probably couldn't even sell it on eBay now, after going through so many repairs.