While navigating the menus and in particular, using the scenario editor. The game causes the motherboard to emit a high frequency whine/screech, electricity sound, for a lack of a better term.
The sound changes and gets worse as the scenario editor controls are used and changes frequency as I click around.
Playing the game itself or viewing a map preview does not cause this. The motherboard is a Asus A8N32-SLI-deluxe, 2MB RAM, Win XP SP2 and 7800 GTX.
The only other game that caused the computer to make the same noise as Shock Force was Tiberium Sun.