#include <windows.h>

#define MON_OFF  2

int WINAPI WinMain (HINSTANCE hInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpCmdLine,
                    int nCmdShow) {
  Sleep(500);
  SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, (WPARAM)SC_MONITORPOWER, (LPARAM)MON_OFF);
  return 0;
}