Hi, I had 4x 2gb ddr3 / 10600 unbuffered 240pin ram memory installed in my acer m5910, everything worked fine (stock) Wanted to upgrade my computer and bought 4x4 4gb of same ddr3 for total of 16gb After installing 4 new sticks acer didnt even boot up, tried with different ports and then with only 2x4 sticks and same thing happened.