Hey guys, So I thought it was time to upgrade the ram in my MacBook. It had 2GB DDR 3 1066Mhz RAM. So, I wanted to go to 8GB. My Supplier gave me 2 x 4GB DDR 3 1333Mhz ram. So, I pop'd both 4Gbs in. MacBook starts, but just beeps at me. So I tried on 4GB model - same thing I tried 4GB model and the original 1GB - it boots! Tried this combo with both 4GB models, same story! Checked in OS X Lion with About this mac and it shows 5GB with 1 x 1GB and 1 x 4GB. Can anyone help me as to what is going on? Thank you!