I just upgraded my MBP from 2gb of RAM to 4gb and now I am getting errors that I have to hold the power button and restart. the RAM I put in is Mushkin 2gb sticks, DDR3, 1067Mhz laptop RAM which matches the RAM that the MBP came with, I bought a pack with 2 of the 2gb sticks in it to total 4gb when in the system. The upgrade went smooth, I tried with one of the sticks, one old and ran fine, and tried with both of the new ones and it ran fine also. but after a while I have been getting these random restart messages. After I installed the RAM I ran a memory test and it came back all positive. any one have an idea as to what is wrong? Thanks in advance for the help!