Acer Altos R720 Series - Manual (Page 185)

175
OS 6
PCI I/O 4
power supply 5
processor 3
SAS mid-plane board 4
serial ATA port 4
system fan 5
system boards 17
backplane 19
SAS backplane board 19
mainboard 17
mid-plane board
SAS mid-plane board 21
system diagnostic LEDs 22
system fan
replacing 72
system features 3
system jumpers 23
system memory
reconfiguring 80
system tour 1
system upgrade 33
ESD precautions 35
installation precautions 35
post-installation instructions 36
preinstallation instructions 35
T
tape drive
installing 60
top cover
installing 41
removing 41
troubleshooting 133
confirming loading of the OS 138
hardware diagnostic testing 137
POST error codes 147
problems 138
adapter stopped working 142
cannot connect to a network
141
cannot detect bootable drive
141
cannot detect memory 141
cannot eject DVD/CD tray 140
cannot read DVD/CD 140
controller stopped working
142
DVD/CD drive no light 140
HDD LED no light 139
HDD not recognized 141
initial system installation 135
LAN LED no light 142
network connection fails 142
no characters on screen 143
no video 142
power indicator no light 138
Processors not recognized
139
server boot does not complete
POST 139
system fans do not rotate 144
resetting the system 135
verifying key system lights 137
turning off the system 32
turning on the system 29
power-on problems 30
U
upgrading the BIOS 132