Ok, so I have an HP Pavilion dv6000 running Vista. My computer has two slots for memory which were occupied by two 512 sticks. I recently installed one Kingston Technology - 2GB PC2-6400 DDR2, which brought my memory up to 2.50. Things were good, but not fast enough. So today, I installed G.SKILL 2GB 200-Pin DDR2 SO-DIMM DDR2 667 (PC2 5300). Well, my cpu boots up fine but my screen goes blank. I can hear programs running and my machine acts fine, it's just the screen.