After a short time - about 1 minute - the monitor starts flickering and i dont know what to do - it then tells me that i have to shoud down
What can i do?
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Remove the frame and examine the 24 cans (capacitors), for swelling and/or leakage. Let us know your results.
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Follow steps one and two of this guide: iMac G5 20" Model A1076 Power Supply Replacement
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It looks like your iMac has the same problem as one a friend bought.
If the capacitors show no damage than the most possible problem is the NVidia graphics chip. There were a few with bad soldering balls. This means that the iMac disconnects the graphics bus during running due to bad soldering. Some run 1min, some 5min, some 15min.
I currently try to fix this problem by heating up carefully the area below the NVidia chip. Other people were sucessfull by putting the whole motherboard inside an oven at 250°C for 10min covering all of the board excluding the area with the NVidia chip with aluminium foile.
At ebay Germany there is a company doing professional repair with a 20k$ ERSA soldering robot. But this is approx. 300$, a price you can get a working iMac 20".
Apple had a exchange program but it ended a few years ago as far as I know.
You can search for baking nvidia cards and you find a lot of solutions.
Good luck.
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Apple iMac G5/2.0 20-Inch (ALS) Specs
Identifiers: Ambient Light Sensor - M9845LL/A - PowerMac8,2 - A1076 - 2056
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