ESC4000 G3S has a visible Q-Code/port 80 LED display LED for simple monitoring of the entire boot process, from the early hardware-awakening stages to the launch of the operating system and beyond. With the features of quick initialization guidance of BIOS, users can realize system initialization state in seconds; furthermore users are able to diagnose system instantly through POST code message in the POST stage. The rear power, button, location/HDD Active LED let the users check the server's status easily which saves time and effort. Also, the exclusive tool-less rail kit design helps the user to deploy the servers in an easy and simple way.