M-BIST 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: Before initiating M-BIST, ensure that the computer is in a power-off state.
Press and hold both the
M key and the power button to initiate M-BIST.
The battery indicator LED may exhibit two states:
Off: No fault was detected.
Amber and White: 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) for 30 seconds and then turn off.
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