Flashing screen in 1.8.1

This is not in the launcher, but when I start the game, the screen flickers around. some items in my inventory will be flashing or flickering. And the screen will sometimes go blank for a few seconds, but the sounds will continue. I deleted then re-downloaded the game and it still continues. Deleted my mods, and it continues. Ran a new directory, and it continues. It isn't my monitor because it continued on two of them. This only happens with Minecraft, no other programs. If some one else has experienced this, or knows what's happening, please help.