Hi, I posted here last month concerning a ram upgrade for my MBP. It would work with one card, boosting ram capabilities to 10GB, or stand alone to 8GB. I understood the other card to be faulty and requested a new kit. Fast forward and I have a new set of cards, and the same issue. One card causes one beep stand alone, and three beeps when paired with an original 2GB card. The other new card works alone, in both slots, and with an original 2GB card. I understand the slots to be functional as the original ram works fine, and one new card also works well. I emailed the manufacturer who said both the original cards passed all tests, so is it anything besides faulty ram? I am ordering from Flexx Memory. I would like to troubleshoot before I send back the ram for a second time. Any help is appreciated, thank you.