Display output changes when playing games

Hi guys, I have a problem with my monitor output changing when I play games. I only have one monitor connected via hdmi to my video card. It's sli. It seems to be set as the only monitor in all the settings but for some reason if I start a game the display output changes so I have to pull the connector out and change it to the second connector for the display to work again. When I close the game, I have to switch it back.

I had this same problem back in Vista but somehow it stopped, I am running Windows 7 now.

Does anyone know how I can solve this? Thanks.

Hi.

That's not a problem. The resolution is supposed to change when you start a game and it's working correctly.

Set the resolution you want to use in each individual game.

No, it's not the resolution changing. The display goes completely blank and I have to physically change the port it's connected to for it to display anything.

Yes it is changing. That's why it goes blank. No need to switch display ports. You should leave the monitor attached to the one that always works for games. That's your primary output.

But it stays blank. I have tried leaving it for 5 minutes. The reason I have to change it is because when I switch from windows to the game(alt-tab or just exiting the game) it goes blank and stays blank.