anyone had this problem with thier laptop? i got a w520 with 4 slots for ram and yet i can only put 2 ram because the laptop wont start with the 3rd ram installed. It keeps giving me beeping errors like; B-BBB-BBB-B (B= beep ; - = pause) .Faulty ram or am i missing something in the setting for bios? its cpu is an i5-2520m so limits is 16gb.