There is a really good deal right now on a used r9 290x Tri-X (it's around 40-50 $). However the seller advertises it as faulty. He tried it with a 400W psu. The PC started up as it should, but no signal. I've read, that the recommended psu for this card is 750 W, but it needs at least like a good quality 600W one. How likely it is, that the card is actually faulty? To me it seems like a simple problem with the power supply, and in that case, this would be a no-brainer.