function SetFullscreenMode:Boolean;
var DeviceMode : TDevMode;
begin
   with DeviceMode do begin
      dmSize:=SizeOf(DeviceMode);
      dmBitsPerPel:=16;
      dmPelsWidth:=640;
      dmPelsHeight:=480;
      dmFields:=DM_BITSPERPEL or DM_PELSWIDTH or DM_PELSHEIGHT;
      result:=False;
      if ChangeDisplaySettings(DeviceMode,CDS_TEST or CDS_FULLSCREEN) <> DISP_CHANGE_SUCCESSFUL then Exit;
      Result:=ChangeDisplaySettings(DeviceMode,CDS_FULLSCREEN) = DISP_CHANGE_SUCCESSFUL;
   end;
end;
procedure RestoreDefaultMode;
var T : TDevMode absolute 0;
begin
   ChangeDisplaySettings(T,CDS_FULLSCREEN);
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
   if setFullScreenMode then begin
      sleep(7000);
      RestoreDefaultMode;
   end;
end;
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