Hello, went to change a noisy fan on the heat sink but when I took it out it ripped my phenom 955 cpu out and has damaged the pins so I put in a phenom 550 but cant get all ram to work in all the slots ..using a asrock m3a770de it sugguest if your using 1600 MHz ram to use slot 3-4 but the only slots that work are 1-3 it really has got me beat .when I boot up with all ram in it wont reach post . It was sugguested to use memtest to see if I had dodgy slots but how can I use it if it don't boot up with all ram in or do I not need all ram in to see if slots are working