I just upgraded my P4 motherboard ram from a 256mb stick to a 1GB stick. I get no response when the system is turned on, besides power, no post or anything though. I don't get any kind of beep either. Both sticks are PC2100 DDR SDRAM. The only differance between them I can find is the size. I checked several times to make sure it was seated properly and still no luck there. Did I get a bad stick of ram? This one has just got me stumped.