Intel Desktop Board D2550DC2 Product Guide
52
BIOS Front-panel Power LED Blink Codes
The BI OS also blinks t he front - panel pow er LED t o signal st at us m essages and err or
m essages indicat ing cer t ain recov erable err or s t hat occur during t he POST. The blink
codes ar e list ed in Table 15.
Table 15. BIOS Front-panel Power LED Blink Codes
Type
Pattern
Note
BI OS updat e in
progress
Off when t he updat e begins, t hen on for
0.5 second, and t hen off for 0.5 second.
The pat t ern repeat s unt il t he BI OS updat e
is com plet e.
Video error
( Not e)
On- off ( 1.0 second each) t wo t im es, t hen a
2.5- second pause ( off) ; t he ent ire pat t ern
repeat s ( blinks and pause) unt il t he syst em
is powered off.
When no VGA opt ion ROM
is found.
Mem ory error
On- off ( 1.0 second each) t hree t im es, t hen
a 2.5- second pause ( off) ; t he ent ire pat t ern
repeat s ( blinks and pause) unt il t he syst em
is powered off.
Therm al t rip warning
Each beep will be accom panied by t he
following blink pat t ern: 0.25 second on,
0.25 second off, 0.25 second on,
0.25 second off. This result s in a t ot al of
16 blinks followed by syst em shut down.
Not e: Disabled by default BI OS Set up opt ion.
POST Error Messages
The BI OS also displays er ror m essages on t he video m onit or w hen cert ain recov erable
er rors occur during t he POST. Table 16 list s t he er ror m essages w it h a brief
descript ion of each.
Table 16. POST Error Messages
Error Message
Explanation
CMOS Bat t ery Low
The bat t ery m ay be losing power.
CMOS Checksum Bad
The CMOS checksum is incorrect . The CMOS m em ory
m ay have been corrupt ed. Run Set up t o reset values.
Mem ory Size Decreased
Mem ory size has decreased since t he last boot . I f no
m em ory was rem oved, t hen m em ory m ay be bad.
No Boot Device Available
Syst em did not find a device t o boot .
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