I just installed new ram 4gb. I already have 8gb in two slots. As soon as the windows logo comes up on the screen, my PC restarts. I have already tried taking out the cmos battery and resetting bios but nothing is working. When I bought the ram, it was working fine at the retail but now the Os won't load and the pc restarts and after 2-3 times it becomes stuck at the company logo (Gateway specifically).