I took the system test and bought what the reccomended.I decided to buy 4GB RAM From Crucial Thinking since because of the great reviews it would be well great!!! Then It came so I installed it thinking it would have no problem since I followed the instructions I was terribly wrong I installed it and my macbook made a beeping noise because the memory gave it issues i reinstalled the memory 8 times to be exact the reinstalled the regular memory and it was fine I even tried using both at one time. After staying on hold with Crucial for an hour to return it I was hung up on. I give them 0 STARS and I do plan to get my money back, but does anyone know what the problem might be? 
~Thanks
~Thanks