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7.1 Introduction
Each time the computer is turned on, the system BIOS runs a series of internal checks on the hardware. This
power-on self test (post) allows the computer to detect problems as early as the power-on stage. Error messages of
post can alert you to the problems of your computer.If an error is detected during these tests, you will see an error
message displayed on the screen. If the error occurs before the display is initialized, then the screen cannot display
the error message. Error codes or system beeps are used to identify a post error that occurs when the screen is not
available.
The value for the diagnostic port is written at the beginning of the test. Therefore, if the test failed, the user can
determine where the problem occurred by reading the last value written to the port by the debug card plug at MINI
PCI slot.
7. Maintenance
Diagnostics
MiTac Secret
Confidential Document
