program Project1;
{$APPTYPE CONSOLE}
uses Windows, Messages;
begin
SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, 2);//关闭显器
Sleep(10000);//延长时间,参数越大,黑屏时间就越长。
SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, -1);打开显器
end.
嘿,这样就行了,要是你高兴,你可以加个开机起启,让他一开机就黑屏。