my computer was working fine a few days ago, and when i went to turn it on today. the monitor would show anything. when the monitor is on but the computer isnt the monitor will tell me that there is no signal. when i turn on the computer the so signal warning goes away, but the screen just stays black. The GPU fan is spinning so i know it is getting power, and there is no where to plug power into the GPU so it isnt that. Also when i take out the graphics card and plug the VGA cable into the onboard video port i get the same problem. There isnt much i can do because i cant even boot it into BIOS. It is a fairly old computer, so i dont know what motherboard or CPU but i do know that the graphics card is a Gigabyte Radeon R7 240. I also tried it with a zotac 7200gs. what i do know about the motherboard and CPU is that theya re AMD if that changes anything, and they are both pretty old. another thing is that there is only a VGA Connector on the motherboard there is no other option for video.