I purchased 2 sticks of RAM from eBay, but they're not working on my '09 MacBook.... The top stick is one of two of my original 1GB. The bottom stick is one of two of the purchased 2GB RAM. Are they the same? When I insert the purchased RAM, the MB beeps once every 3-5 seconds. I've tried various combinations with originals and purchased sticks. I've tried one at a time. I've resetted the PRAM. I don't know what else to do. I've tried talking to the seller, but he's refusing to accept the return cause he had a no return policy on these sticks. So I've escalated this to eBay to make a decision. So I'm asking here if the sticks that I purchased the same as my original. Thanks!!