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Intel Desktop Board D425KT Product Guide
48
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 13.
Table 13.
BIOS
Front-panel Power LED Blink Codes
Type Pattern Note
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 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.
POST Error Messages
The BIOS also displays error messages on the video monitor when certain recoverable
errors occur during the POST. Table 14 lists the error messages with a brief
description of each.
Table 14.
POST E
rror Messages
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.