Manual

77
The Power-On Self Test
The Power-On Self Test (POST) runs every time you turn on or reset the DeskNote. The POST
checks memory, the main system board, the display, the keyboard, the disk drives, and other
installed options.
A few seconds after you turn on your computer, a copyright message appears on your display
screen. A memory test message appears next; as the test continues, memory size increases until
all installed memory is tested. Normally, the only test routine visible on the screen will be the
memory test.
Two classifications of malfunctions can be detected during the POST:
• Error messages that indicate a failure with either the hardware, the software, or the Basic
Input/Output System (BIOS). These critical malfunctions prevent the computer from operating at
all or could cause incorrect and apparent results. An example of a critical error is microprocessor
malfunction.
• Messages that furnish important information on the power-on and boot processes (such as
memory status). These non-critical malfunctions are those that cause incorrect results that may not
be readily apparent. An example of a non-critical error would be a memory chip failure.
In general, if the POST detects a system board failure (a critical error), the computer halts and
generates a series of beeps. If failure is detected in an area other than the system board (such as
the display, keyboard, or an adapter card) an error message is displayed on the screen and testing
is stopped. It is important to remember that the POST does not test all areas of the computer, only
those that allow it to be operational enough to run diagnostic programs.
If your system does not successfully complete the POST, but displays a blank screen, emits a
series of beeps, or displays an error code, consult your dealer.