Help!!! my computer! two beeps ?

I have a gateway lx6810. I was trying to upgrade NVIDIA.. it said to complete it had to restart .. now it won't turn on .. the fans and power light will go on .. there is in no picture .. the media control center lights won't turn on. It beeps once at start up then two short beeps. Doing the research they say its the memory .. I have 4 RAM sticks. I have tried to switch them take some out. I tried with only one.. doesn't change..