My graphic card died and I was looking for a new one to replace it. I bought an Radeon R7 250 and no joy, nothing on the screen. When I start the computer, nothing appear on the screen and I don't have any warning from the bios (no beep or no blinking).
I thought that the power supply (300W original) wasn't strong enough, so I installed a new one (550W) and I have the same result. When I removed the card, the computer is starting normally.