About Your System 13
2 Power-on indicator/ 
power button 
The power-on indicator lights 
when the system power is on.
The power button controls the 
DC power supply output to the system. 
When the optional system bezel is 
installed, the power button is not 
accessible. 
NOTE: When powering on the system, 
the video monitor can take from several 
seconds to over 2 minutes to display an 
image, depending on the amount of 
memory installed in the system. 
NOTE: On ACPI-compliant operating 
systems, turning off the system using the 
power button causes the system to 
perform a graceful shutdown before 
power to the system is turned off. 
NOTE: To force an ungraceful shutdown, 
press and hold the power button for 
five seconds.
3 NMI button  Used to troubleshoot software and 
device driver errors when using certain 
operating systems. This button can be 
pressed using the end of a paper clip. 
Use this button only if directed to do so 
by qualified support personnel or by the 
operating system's documentation. 
4 System identification 
button
The identification buttons on the front 
and back panels can be used to locate 
a particular system within a rack. 
When one of these buttons is pushed, 
the blue system status indicator on the 
back blinks until one of the buttons is 
pushed again.
5 Hard drives  Up to twelve 3.5-inch or 2.5-inch, 
hot-swappable SAS or SATA drives.
Item Indicator, Button, 
or Connector
Icon Description
book.book  Page 13  Wednesday, March 3, 2010  10:37 AM