Tuesday, I installed a new ram stick inside of my computer. Then turned on the computer and the monitor and the computer is running (I hear it) but the monitor just shows a black screen. I turned off the computer and monitor light was still green (meaning its on). I thought that was wierd. So I tried taking out the ram and putting my old one back in, didn't work. The same thing happens. Do I need another monitor, did I mess up something internally? What do I do next? Thanks.