Hi I've been having trouble with an old pc. The display just stopped working while playing a game on steam. I've done some troubleshooting and it's not the monitor, HDMI cord, or the graphics card itself I tried a couple of different cards still no display. This has happened before, last time I thought it was maybe the drivers, so I switched the card and updated them put the first card back still no display until I tried a different card and it randomly just started to work, I don't know why all I did was switch from the first card to the second and back again. Now no matter which card I try I still get no signal! Any ideas?