Do I have a bad memory slot and what to do about it.

About 3 weeks ago when I came down to my computer, intel imac purchased may 2006, in the morning the screen was black and power button was lit, keyboard did not work and the computer would not wake up from sleep. Rebooted and the power light would come one, no chime or screen power up, and the keyboard would not respond (ie caps lock key would light up). Tried multiple reboots and pulling everything connected out but nothing worked. Next on the torubleshooting list was to remove the ram. With both chips removed, 1gb and 512mb, I would get the flashing powerlight when starting up. I placed back in the 512 chip which is in the slot furthest from the front and the same symptons of just a solid power light with nothing else was exhibited. Removed the chip and placed the 1gb chip back into the slot closest to the front of the computer, everything worked fine. Startup was normal etc. Next, I removed the 1gb chip and put it into the slot towards the back and it would not work, next, moved the 512 chip to the front and all is well. Therefore, I think I have a bad memory slot given the torubleshooting procedures. Is this a correct assumption?
Here are my questions:
1. Are there any software solutions that will tell if the memory slot is indeed bad?
2. Does this sound like a hardware issue or is there an update to the core system that would fix this problem?
3. In order to get this repaired, would I take the imac to the apple store?
4. The computer was purchased in May 2006, if I purchased an applecare protection plan, would that cover the repairs or does it need to be purchased within 90 days of the computer?
Thanks in advance.

I think that sounds like a firmware update gone bad. Apple page I found says: "In the rare case that your computer displays a black screen after start up, you will need to restore your computers firmware back to factory condition before you can apply firmware update."
Dont know, but sounds like it.
http://docs.info.apple.com/article.html?artnum=303364
may be worth a try.

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