I am not sure what you are saying
iMac G5s were unbelieveably bad in terms of reliability. However, if they work, they are fine, and not "pieces of crap".
I am not sure what you are saying
Don´t Panic!
I have an iMac G5 (Ambient Light Sensor) 20¨ALS.
Disk hard SATA 7200 rpm 250 Gb.
2 Gb RAM
He had incidents of shutdown due to overheating and after a power outage did not turn on.
I removed the back cover, I checked very detail all the capacitors on the Board (all were fine), ran the Led Test: Connect electrical power and the first led must be lit, if it turns on then it is very likely that the Board well.
In my case I removed the AC Power Unit, I opened the box and there I found several blown capacitors, took her to a technician specialized in AC Power Units.
There replaced you the blown capacitors.
Final cost U$ 35.
(These models tend to overheat, but it is a matter of not having too many applications open at once, clean dust and grease that accumulates inside the ventilation ducts and heat sinks)
Dust and nicotine deposits well into your computer. If you check the fans you'll find batteries from dust.
iFixit has guide detailed open and review each specific model.
It not holding to condemn the device yet.
I've seen almost apocalyptic entries in this forum before buying more and more technological junk learn something about what we have!
Best regards
Ned
----------
Bad capacitors were inside the AC Power Unit