But what happens if you don't hit [Enter]? It should hesitate for a moment, then continue loading with the default configuration. IIRC, it pauses and instructs you at the bottom of the screen to hit [Enter] or one to the [Fn] keys if you want to change the configuration or how it boots. But, if you don't want to change that (and it sounds as if you don't), then don't hit any key at all.