Help with Powerbook!

Hey guys, I recently dropped my 3 year old Powerbook on the ground with its case on, and this seemed to have dislodged the standard 512 mb of RAM it has in it. When I turn it on it made a beeping noise, and the little light in the front would signal 3 times. I called and said basically I would have to take apart the entire thing. So I went home and took out as many screws as I could, but I couldn't take the top 2 screws on the keyboard near the screen. But I turned on the powerbook anyway and it worked! this was only temporary though, because it sometimes will stop for no reason, and repeat the problem. A quick fix for this right now is that I left the bottom plate where you install more RAM open, so I just play with the ram from there, and sometimes it will work. My question is how do I fix this? By adding another 512 mb will that save me from taking it apart again? BEcause after I saw it working I went back through the long process of screwing everything back together again, and I dont want to repeat that. Thanks!