Maintenance Diagnostics; Introduction - MiTAC 8050QMA Service Manual

80 50QMA N/B Maintenance
80 50QMA N/B Maintenance

7. Maintenance Diagnostics

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-80H by the debug card plug at
MINI PCI slot.
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