Bad Logic Board on 17" 2ghz imac-3 days old

I just purchased (12/30) a 17" 2ghz refurb from apple and is now having the logic board replace at a local apple store. It took a bit longer to arrive due to the holidays. Out of the box everything was neatly packaged and appeared very clean and like new.
When I first started up right out of the box I immediately went through the apple setup assistant, ran the software updates, went to restart and nothing happened... no startup sound, black screen, glowing ambient light.... I unplugged the imac from the power strip, waited 1 minute, plugged it back in and it started up... so I thought everthing was fine...
Started some software installs, restarted and the same thing but the computer would not even restart after I plugged it from the powerstrip. I called Apple Support who was very helpful. They had me startup from the Apple Hardware Test CD and everything passed so I was asked to take the imac to a local Apple store to reset the PMU which involved taking the back of the imac off. The Apple Support Rep offered to help me over the phone but I felt more compfortable bringing it to the Apple Store. After the PMU was reset we performed multiple restrts with no problems so I took my imac home.
The following day I tried opening folder or a cd on the desktop and as soon as I double-clicked the folder or icon it would immediately close without diplaying the contents of the folder. I then did a fresh install of the OSX Tiger (archive & install) and I was the able to the open the items I having problems with. Proceeded to update my imac with the software updates -restarted-and no startup sound, black screen, no video. Unplugged it from the power cord and same no startup.
I took it immediately back to the Apple Store and the informed me the Logic Board had to be replaced... $850.00. I am defintiely purchasing the Apple Care for piece of mind. At the Apple Store they were very helpful and friendly. They said I should have my imac back in a week but I'll wait and see. If I dont hear anything by the middle of the week they said I should call.
Has anyone experienced these problems or sympthoms? Thank You for any replies.
17" imac, 2ghz, 512MB, 250GB   Mac OS X (10.4.3)   Refurb

Just to clarify. The rev Bs had same probs. And many rev Bs fall in that range as they are considered rev A having used the same internal components. What also is worth noting. The rev A and Bs use the same internal structure and placement of components. (They are arranged same way.) Which IMO is the problem. The Rev Cs (the newest ones) have been completely redone as well as adding a vent behind the support arm the size of a silver dollar.
They really learned a huge lesson on how to keep these cool. The first 2 revisions had all the heat generating components at the bottom of the case. bad placement for these things as they "marinate" the entire Mb, Hd, and Optical drive. The rev Cs are flipped around so all heat generating components are at the top of the case, nearest the vents. The fans also blow in a different pattern across the MB.
heres a pic of the two different set ups for comparison.
http://babelfish.altavista.com/babelfish/trurlpagecontent?lp=ja_en&trurl=http%3a%2f%2fwww.kodawarisan.com%2fimacg5isight%2fimacg502i.html
*Also heres a pic and story of how they rearranged the internals.
http://www.xlr8yourmac.com/systems/imacisight_internals/imac_g5_isightinside.html
Enjoy. And know what youre getting into with ANY rev A and B because its not entirely components that make them garbage. Its HOW they are assembled. they will fail, its a mathematical certainly. heat is the most incideous thing for a computer. The rev As and Bs just arent arranged in such a way internally that the fans could ever keep them adequately cool. Again, after all Ive read and experienced first hand this is my opinion only.

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