I have bought 4x2 GB Corsair MAC 1333mhz for my Macbook 2010 Model: Macbookpro6.2 Now only works in safe mode and detect 8GB, if boots normal give-me error and restart, i have already put the old memorys and everything fine. With only one memory the problem its the same, try do install a fresh copy of Os X and give-me errors too. Should be a problem with memorys ? Its strange in safe mode its fine. Thanks in advance.