Good Gear Guide
Server walkthrough: Taking apart the HP Proliant D...
The status panel on the front of the server has an array of LEDs that light up in green when everything is running without any problems. An amber colour means that a failure has occurred, but that there is a redundancy in place. If the light is red, that means the failure is critical.
Server walkthrough: Taking apart the HP Proliant DL380 G6 server