This is my first post ever, so I'd like to say hello to everyone on Techspot (been kind of a lurker), and I'll keep the whole story short, Yesterday my best friend began to move away for college, and his computer was going to be passed down to me. It's in near perfect condition, and the only thing we had to replace before starting it up again was the power supply. His supply before was a solid 400, and the one we bought is a 450w. We bring it back to his house, replace the power supply and voila! The computer is running. So it continues to run perfectly fine, we play games on it and make sure everything is smooth, and it is. Start -> Shutdown. We bring it back to my house. So we plug in everything, and we're about to start it up. My buddy presses the power button, everything goes on, but the monitor remains black while still receiving a signal. His nVidia 7800 gt gfx card has it's fan running, which would leave me to assume it's running fine. it's NOT the monitor. I've tried other monitors and they get a signal, but its a black screen. The monitor also works on other computers. The gfx card has two HD ports, and my friend had two converters for them so not just an HD monitor could run on it. I've tried different combos of cords/converters and could not figure out what is wrong. Any help is appreciated, thanks!