Alright, so, big update. First off, I'm attaching a picture of all my memory modules. I'll be describing what I did with each stick and addressing them by number, so for the picture, the bottom stick is ram 1 and the top stick is ram 5. I'll lay out the sequence of events as clearly as I can of what all I just did and what happened with it.
Test 1: Inserted ram 5 into memory slot 2 on the motherboard. System successfully powered on and showed the memory module in the bios menu under Memory Bank 1.
Test 2: Took out ram 5, inserted ram 3 into memory slot 2, noticing the ram didn't go in fully smoothly like in test 1. System failed to POST, gave a buzzer code of three long beeps, and an led code orange-orange-green-green.
Test 3: Took out ram 3, inserted ram 4 into memory slot 2. The memory module snapped in harshly. System failed to Post, did not give a buzzer code (possibly because I was spamming the delete key), but gave an led code orange-orange-green-orange.
Test 4: Took out ram 3, then inserted it into memory slot 2 again, being careful to slide it in more smoothly. This time the system passed the POST, and registered 64MB of ram in Memory Bank 1 from the bios.
Test 5: Inserted ram 5 into memory slot 1. Computer passed the POST and registered all memory present in the bios.
Soooo I guess all's well that ends well? I don't know for sure why it worked the way it did. There's not really anything I did differently tonight from previous attempts. If anyone has any guesses as to why this worked the way it did, I'd like to hear your hypotheses.
Right now the system works. However for all I know, memory slot 2 could randomly stop working again in the future, so don't consider this necessarily over yet. We'll have to see if it continues to work reliably.