Memory upgrade - computer won't come on

Hi all,
Last week I put a new battery in my MacBook and noticed that one of those three screws by the memory slots was loose. I tried to tighten it but it (or perhaps the hole) was apparently stripped as it did not work. I was able to get the battery in by holding it down and the computer worked fine. Then my memory upgrade arrived and after getting the right screwdriver I was able to unscrew everything, put the new memory in, and put that plate back on. . . except that one screw would not go back in. I was again able to get the battery in by holding that plate down, but the computer would not turn on. The power light just kept blinking, even when I used the power cord. Not knowing if my computer failed to recognize the new memory, I put the old memory back in, but the computer is dead. It seems to power on but the screen is dark. I am using my husband's old computer.
Do you think it's an issue with the memory? I'm fairly sure I put it in correctly, and didn't think that would affect whether or not the machine even came on. My own thought is that without that stupid screw down tight something is not connecting anymore, and that I will have to take it to the Apple Store to get it fixed. Does that sound right and if so - any idea what it will cost? Should I just get a new computer?? I attempted to do my own upgrade to save money (Apple Store told me $180 to install 2MB!!) but it's looking like that has backfired.
Thanks so much!
~Gina

Thanks for your help. Yes, it is a Core Duo MB. It is dead once again so I'm afraid I can't tell you anything besides the fact that I purchased it in June, 2006 so I think it is a first generation machine.
Like I said previously, I did get it to boot but it only recognized one of my old 256MB cards, and I don't know which slot. I tried reseating and switching them and pushing them in as much as I could but it's totally not coming on now. This is the product I purchased:
http://www.ec.kingston.com/ecom/configurator_new/partsinfo.asp?root=us&LinkBack= http://www.kingston.com&ktcpartno=KTA-MB667K2/2G
I suspect, though, that something else is going on since the old cards don't seem to work anymore. Is it the l-bracket not screwing in all the way? Could a ribbon cable be loose (I saw this on the Kingston FAQ) Does an entire slot need to be repaired? Should I even bother calling Kingston Tech Support? Is there anything else I can do before taking it to the Apple Store?
Thanks again!
~Gina

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