Second motherboard goes bad

Hi there,
my iMac G5 rev A needs another motherboard replacement. This is the second one in 14 months, and now I wonder if this is just bad luck, or should I think about possible reasons for that kind of failure? The first time I had the motherboard replaced was seven months after I bought the machine, the second one again after seven months since the last replacement. My temperatures have been very constant (between 49 and 52 C for the HD, and between 52 and 55 for CPU). Could there be something else I am missing? Or is it just rev A blues?
Zo

Heat is the culprit in most of the problems with the Rev As and some rev Bs. I owned a rev A iMac G5 and had 5 issues, major issues and in the end, on the 13th month I had it replaced because I had had SOOOO many problems and failures with the computer. Luckily I got a Rev C or iSight iMac G520 " and lemme tell you, the huge changes they did on the inside and adding the vent on the center of the back panel really has made this a much more stable computer. Gone are the noisey fans and HIGH run temps. This model is rock solid now. If you havent looked Ill link the comparison photos on just how much they changed this computer since Rev A. Its amazing!
I'd go for a replacement. It sounds like you have several documented major issues, if you push it and are calm, they may just give you one. ( If you are so inclined that is.) I had to debate my case for 2 hours very calmly and finally got someone who could see that after 5 major repairs, the computer just wasnt working as intended.
Anyway, good luck and heres that photo so you can see just what the prob was/is for the Rev As and Bs. Look at how they completely rearranged the internals, putting heat generating components at the top instead bottom and moving the Ram away from the processor. The fans are even at the bottom, where they should be instead on the bottom. Anyway, enjoy, good luck to you.
http://babelfish.altavista.com/babelfish/trurlpagecontent?lp=ja_en&trurl=http%3a%2f%2fwww.kodawarisan.com%2fimacg5isight%2fimacg502i.html\
Also, heres one that tells you just what they did and why.
http://www.xlr8yourmac.com/systems/imacisight_internals/imac_g5_isightinside.html

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Radeon X850XT
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