Well, you're not the only one. My iMac G5 ALS of two years is having major hardware problems. At this point, I've tried various RAM modules and I'm still having problems. I'm suspecting either the logic board or the power supply. The LEDs on the inside will sometimes show three green and then sometimes show two green (the third one which signifies the connection from the motherboard to the LCD screen sometimes won't come on). Looking at the logic board, it's evident that some capacitors have bulged and one looks like it's leaked. As it stands, my serial number falls outside of the affected Macs in the logic board replacement program even though it's showing the same signs of defectiveness.

I've already got a letter and pictures ready to send out to the Apple educational rep since I work for two schools. I'm hoping he can help me out without me incurring charges for issues that weren't mine, especially since I've helped get some Macs into one of my schools. As it stands, I just can't afford to spend money on repairs for a Mac that I paid over $2K for only 2 years ago. It's either find a used Mac that will run OS X or delve in the world of the Hackint0sh. Unfortunately for Apple or any other manufacturer, it's going to be a long time before I purchase new from a brand name vendor again.