Maintenance Diagnostics; Introduction - Prestigio CAVALIERE 141 Technical & Service Manual

Prestigio Cavaliere 141

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
Therefore, if the test failed, the user can determine where the problem occurred
by reading the last value written to port
(378H) is written at the beginning of the test.
378H by the eight LEDs on board.
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