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Table 7-6
Power button functions and lights and their descriptions (continued)
Component
Rear AC adapter light
Blinking light codes
During startup, the computer may not boot properly. If this occurs, blinking light codes can help identify the
cause.
The computer uses the following blinking lights to identify a hardware component that reports an error during
startup. For more information, see
Table 7-7
Blinking light codes and what they mean
Blink codes
Amber battery light: blinks 1 Hz continuously
Caps and num lk lights = 1 blink
Caps and num lk lights = 2 blinks
Caps and num lk lights = 3 blinks
Caps and num lk lights = 4 blinks
Caps and num lk lights = 5 blinks
Caps and num lk lights = 6 blinks
Caps and num lk lights = 7 blinks
Caps and num lk lights = 8 blinks
POST error messages
The Power-On Self-Test (POST) is a series of diagnostic tests that runs automatically when the computer
is turned on. If the POST encounters a problem, visual error messages are displayed before the operating
system starts.
POST checks the following items to ensure that the computer system is functioning properly:
Memory
●
Processors
●
BIOS
●
Mass storage devices
●
Fans
●
The following table describes errors encountered during HP PC Hardware Diagnostics (UEFI).
Description
Amber: HP 3D DriveGuard has temporarily parked the hard drive.
White: The computer is connected to external power.
Off: The computer is not connected to external power.
Blinking lights and boot error codes on page
Error
Embedded controller unable to load firmware
Processor not executing code
BIOS recovery code unable to find valid BIOS recovery image
Memory module error
Graphics controller error
System board error
Intel Trusted Execution Technology (TXT) Error
Sure Start unable to find valid BIOS Boot Block image
Sure Start has identified a problem (Manual Recovery Policy Set)
125.
Blinking light codes
77
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Troubleshooting
