M-BIST (Built In Self-Test) is the system board built-in self-test diagnostics tool that improves the diagnostics accuracy of system board Embedded Controller (EC) failures.
NOTE:M-BIST can be manually initiated before Power On Self-Test (POST).
How to run M-BIST
NOTE: M-BIST must be initiated on the computer from a power-off state that is either connected to AC power or with a battery only.
Press and hold both the
M key on the keyboard and the
power button to initiate M-BIST.
The battery indicator LED may exhibit two states:
OFF: No fault was detected with the system board.
AMBER: Amber indicates a problem with the system board.
If there is a failure with the system board, the battery status LED flashes one of the following error codes for 30 seconds:
Table 1. LED error codesLED error codes
Blinking Pattern
Possible Problem
Amber
White
2
1
CPU Failure
2
8
LCD Power Rail Failure
1
1
TPM Detection Failure
2
4
Memory/RAM failure
If there is no failure with the system board, the LCD cycles through the solid color screens that are described in the LCD-BIST section for 30 seconds and then turn off.
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