Quite strange that the RAM would cause that problem. I had a similar problem and it was in fact the graphics card that was faulty. Test the RAM within another machine (or rather run it with only the one stick you removed to be sure). Because you might have simply taken the RAM out when that isnt the component at fault yet due to you taking it out you could have stopped the computer from using something that is faulty (i.e. if one of your address buses on the motherboard is damaged that the RAM stick you removed normally uses, by removing the RAM you havent fixed the problem, only masked it because that particular address bus isnt being used).
Does that make sense? Sounded better in my head :S
So bare in mind that removing the RAM might not have solved the problem, you should test the RAM in question within another machine, or run your main machine with ONLY the RAM that you believe is at fault, to see if it still does it. Always nice to double double double check to be sure.