11
BIOS
Front-panel
Power
LED
Blink
Codes
The
BIOS
also
blinks
the
front-panel
power
LED
to
signal
status
messages
and
error
messages
indicating
certain
recoverable
errors
that
occur
during
the
POST.
The
blink
codes
are
listed
in
Table
18.
T
ABLE
4. BIOS F
RONT
-
PANEL
P
OWER
LED B
LINK
C
ODES
Type
Pattern
Frequency
BIOS update in
progress
Off when the update begins, then on for
0.5 second, and then off for 0.5 second.
The pattern repeats until the BIOS update
is complete.
Video error
(Note)
On-off (1.0 second each) two times, then
a 2.5-second pause (off); the entire
pattern repeats (blinks and pause) until
the system is powered off.
When no VGA option
ROM is found.
Memory error
On-off (1.0 second each) three times,
then a 2.5-second pause (off); the entire
pattern repeats (blinks and pause) until
the system is powered off.
Thermal trip
warning
Each beep will be accompanied by the
following blink pattern: 0.25 second on,
0.25 second off, 0.25 second on, 0.25
second off. This results in a total of 16
blinks followed by system shut down.
Note:
Disabled
by
default
BIOS
Setup
option.
POST
Error
Messages
The
BIOS
also
displays
error
messages
on
the
video
monitor
when
certain
recoverable
errors
occur
during
the
POST.
Table
19
lists
the
error
messages
with
a
brief
description
of
each.
T
ABLE
5. POST E
RROR
M
ESSAGES
Error Message
Explanation
CMOS Battery Low
The battery may be losing power.
CMOS Checksum Bad
The CMOS checksum is incorrect. The CMOS memory
may have been corrupted. Run Setup to reset values.
Memory Size Decreased
Memory size has decreased since the last boot. If no
memory was removed, then memory may be bad.
No Boot Device Available
System did not find a device to boot.
