Acer Altos G520 series User Manual page 176

166
Diagnostic LED Decoder
Check
G=Green, R=Red, A+Amber
point
MSB
78 G
7A G
7C G
84 R
85 R
87 R
8C A
8D A
8E A
90 R
A0 R
A1 R
Appendix F: Diagnostic Code Checkpoints
LSB
R R R
R A R
A R R
G OFF OFF
G OFF G
G G G
G OFF OFF
G OFF G
G G OFF
OFF OFF R
OFF R OFF
OFF R G
Description
Initializes IPL devices
controlled by BIOS and
option ROMs.
Intializes remaining
option ROMs.
Generate and write
contents of ESCD in
NVRam.
Log errors encountered
during POST.
Display errors to the user
and get the user response
for error.
Execute BIOS setup if
needed/requested.
Late POST initialization of
chipset registers.
Build ACPI tables (if ACPI
supported).
Program the peripheral
parameters. Enable/
Disable NMI as selected
Late POST initialization of
system management
interrupt.
Check boot password if
installed
Clean-up work needed
before booting to
operating system.