The indicator lights (LEDs) on the front of the tower show the status of the tower, server, and CD/DVD-ROM drives.
Figure : Front-panel indicators
On the tower nearest the top (when floor-mounted):
On the server module, from left to right:
Status is green or off during startup. When the server is ready for use, Status remains green (on). For an error condition, it is red or flashing yellow.
SCSI is green or yellow during startup. When the server is ready for use, the SCSI is off, blinking green when a disc is being read, or blinking green when writing to HP J4150A’s hard disk. For an error condition, it is red.
The network is blinking green whenever a packet is received on a 100-Mbit/s network, and blinking yellow on a 10-Mbit/s network. If the link is lost, it is red.
The power is on when the power is connected from the tower to the server.
On the HP disc drives, from left to right:
(Only on J3278B and J4150A CD-ROM drives) DISC is on (green) when power is connected from the tower to the drive and a CD is inserted. It is off when no CD is inserted.
(Only on J3278B and J4150A CD-ROM drives) ON/BUSY or (only on J4152A DVD-ROM drives) BUSY is on when power is connected from the tower to the drive. It blinks in synchrony with access to an inserted disc. It is off when an inserted disc is not being accessed.