Secondary monitor goes black

Basically when I play some games in full screen mode my secondary monitor will just display blackness, it doesn't do it with all games but it does on most. Is there a way to stop this from happening without having to stop playing full screen games?

I'm not trying have the the game span across 2 monitors I want a desktop on one of them,

In the video settings of the game, make sure the resolution of the game is the same as the resolution of the monitor. sometimes an option allows you to run the game in windowed mode instead of fullscreen. that should fix that. the only problem is that you will see the border of the window, which i personally think is annoying.

The only way I can get them both on the same time is with windowed mode which the border really annoys me.

Most games I've seen have a borderless window option. You'll take a very slight performance hit but you'll still be able to use your second monitor for whatever you want.

You just tab out then in, that will fix it. May not work the first time tho.