I have a Gateway computer, p4 1.70g, 3 Dimm slots, Geforce FX 5200 (about a week old), and 40 gb hd. Ok so here is the deal, I had a pc133 168pin 256 Dimm in slot 1, I went and bought 2x 512 pc133 168pin SD sticks, installed both in slot 2&3. Thats 1280 of ram. So I turned on my comp and my screen is blank saying no signal following with 3 loud beeps coming from my mobo. So now I took out the new ram and left the old one in, not working now, then I tried alone 1 512 sd in slot 1, still not working. Iv tried unpluging all the cords in the back, still nothing. Oh and my keyboard light isnt coming on and the windows intro sound does not play when I bootup and the activity light is on in the back. I have no Idea what to do now. I hope nothing is fried *cough mobo*.