DIMM—Dual in-line memory module
Daughterboard—Type of circuit board that plugs into or is attached to the system board or similar
expansion card to extend its features and services.
GPU–Graphics processor unit
GTS–General Troubleshooting Step
HDD–Hard drive
KB–Keyboard
LVDS–Low-Voltage Differential Signaling
MSG–Maintenance and Service Guide
mWS–Mobile Workstations
WS–Workstations
OS–Operating system
PC–Personal computer
POST–Power-On Self-Test
SSD–Solid-state drive
TSG–Troubleshooting Guide
UEFI–Unified Extensible Firmware Interface
WLAN–Wireless local area network
WWAN–Wireless wide area network
Blinking lights and boot error codes
In some cases, when the host processor is not executing code or does not have the necessary code to
drive the display, light blink codes inform you of a problem.
The following information is from the white paper http://h10032.www1.hp.com/ctg/Manual/c04685655.
Table 7-54
Blinking lights and boot error codes
Blink codes Error
Amber battery light: blinks 1 Hz continuously Embedded Controller unable to load firmware
Caps and num lk lights = 1 blink Processor not executing code
Caps and num lk lights = 2 blinks BIOS recovery code unable to find valid BIOS recovery image
Caps and num lk lights = 3 blinks Memory module error
Caps and num lk lights = 4 blinks Graphics controller error
Caps and num lk lights = 5 blinks System board error
Caps and num lk lights = 6 blinks Intel Trusted Execution Technology (TXT) Error
Caps and num lk lights = 7 blinks Sure Start unable to find valid BIOS Boot Block image
154 Chapter 7 Troubleshooting guide
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