So today I just bought a stick of 1gb DDR ram for my computer. After I install it, there was no video output. When I took it out, the video come back. What happening? Did I buy a bad stick of ram? My mobo is from a HP Pavilion a730n. It has four DDR slots and before I replaced the ram I had two sticks of patriot psd1g400 1gb 3200 DDR ram, 1 Hynix pc2700u-25330 512mb DDR 333mhz ram and 1 stick of Samsung pc3200u-30331 256mb DDR ram. I replaced the 256mb module with a corsair valueselect vs1gb400c3 1gb DDR stick of ram. Anything helps. Thanks.