Graphics card and PSU problem.
So i recently bought a computer online and installed an 8600gt into it. It has a 250w power supply, so i thought it was a little bit too low, but i left it anyways. After 2 weeks, the video card just stopped working. When i plug my monitor back into the motherboard, the on board graphics, the computer works, but when i plug the monitor in through the graphics card, it doesn't work. Its weird though because the fan on the graphics card is still going. Any ideas? If i upgrade my PSU will it fix this and my graphics card will work again?