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POST error codes
Each time you power-on the system, it performs a series of tests that check the
operation of the system and some options. This series of tests is called the
Power-On Self-Test, or POST.
POST does the following operations.
v Checks some basic system-board operations
v Checks the memory operation
v Starts the video operation
If the POST finishes without detecting any problems, a single beep sounds and the
first screen of the operating system or application program appears.
Note: The N70 BIOS Configuration/Setup Utility Program is defaulted to come up
If the POST detects a problem, an error message appears on the screen. A single
problem can cause several error messages to appear. When you correct the cause of
the first error message, the other error messages probably will not appear on the
screen the next time you turn on the system.
If the following error messages occur, follow the recommended action. In the
following index, X can represent any number.
Table 4. Audio beep sequences (continued)
Code
4
All other beep code sequences
One long and one short beep during
POST. Base 640 KB memory error or
shadow RAM error
One long beep and two or three short
beeps during POST
Three short beeps during POST
Continuous beep
Repeating short beeps
quiet (no beep and no memory count and checkpoint code display) when no
errors are detected by POST.
To enable beep and memory count and checkpoint code display when a
successful POST occurs:
v Select Start Options in the Configuration/Setup Utility program (see
"Appendix C. Using the BIOS Configuration/Setup Utility program" on
page 43).
v Set Power-On Self-Test to Enhanced.
Action
Logic Unit
Logic Unit
1. Memory Module
2. Logic Unit
Logic Unit
Logic Unit
1. Memory Module
2. Logic Unit
Logic Unit
1. Keyboard key stuck?
2. Keyboard Cable
3. Logic Unit
Resolving hardware problems
25
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