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ok, removed and reseated video card, put old hard drive back in, reset PMU. Still not boot up, only the fan oscillating like before. I'm afraid it is the power supply.
I'm sorry to hear that it is still not working. That's why we needed to configure your G5 back to the condition it was in when it last worked properly...so we could eliminate anything new you did....like the new hard drive.
By the way...if your power supply is the problem or is dead...you might smell a faint or strong "burnt electrical" odor. Don't ask me to describe this...if you don't know, it's pretty hard to describe.
Also, if your power supply is bad...more than likely your Mac wouldn't do some things or anything...no noises, no lights, no hard drive spinning, no monitor, and no fans sounding like Darth Vader!.
Bad Computer Power Supply Symptoms | eHow.com
WikiAnswers - What are four symptoms that might indicate a faulty power supply for laptop
- Nick