Ok so today I just bought and installed 2GB of RAM, and was wondering is it possible to use my old RAM and new RAM at the same time? Because when I inserted the new RAM and turned my computer on, it made like sort of an alarm sound, but then when I took out my old RAM my computer would turn on just fine. My old RAM was 2 512MB equalling 1GB total, but is made by a different company than my new RAM is. This was the first time I've ever upgraded RAM, but I just wanted to know, is it compatible with my other RAM? Or do I have to take my old RAM out?