While playing my monitor goes to standby mode. I alt-tab to desktop then alt-tab back to game. Power saver is set to 1 hr. Any ideas?

From what I've been told, the monitor will go to standby if the refresh rate is set at a rate that isn't exactly compatible with the game resolution you are attempting to use. The fix would be to either reduce the resolution of the game or change the default refresh rate of your monitor.

Hope that helps.