Acer Altos R720 Series User Manual page 185

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