Hello, everyone! I recently bought 2 ram of 2gb each( ddr2, 667mhz) and when I try to insert them both just one work. the first slot doesn't recognize a 2gb ram, but it recognize a 1gb ddr2 667mhz ram. if I combine 2*2gb ram it only show 2gb of memory but if I combine the 1gb ram with the 2gb...