Do I have bad ram or a bad ram slot?

I just tried to install 1gig of ram into my new 17" iSight. I can feel the ram "snap" into place so it is fully seated. However, the Mac still shows only 512mb of memory. Hardware Profiler shows the ram slot as Empty. I tried unseating and reseating the ram about 5 times with the same result.
I ran Apple Hardware Test and got the following error
post/0/2048
Without the ram installed AHT passes all tests.
I googled this error and saw many hits where people had a bad ram slot (not bad ram). So my question is, what happens when the ram is bad. Does it show the slot as empty. And if so, how can I tell the difference between bad ram and a bad slot on the motherboard? Is the AHT error for bad memory different?
Thanks all.

I went through the same thing. The slot was bad and they had to replace the motherboard. The Apple Care tech came to my home with the new mb on Friday. Two and one half hours from start to finish. This is a very complicated machine now. You have to go through the front of the machine to get to the mb. But after the new board all the memory is seen. And what a difference in performance!
BTW, the error message the AHT said was: Memory error on startup, 0/0/2048. Whatever that means.
Good luck.
Dan Reilly

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