Lenovo IdeaCentre B500 - Manual (Page 26)

Hardware Maintenance Manual
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Beep symptoms
Beep symptoms are tones or a series of tones separated by pauses
(intervals without sound) during POST.
The following tables describes beep symptoms.
Beep Symptom FRU/Action
1 beep
Memory refresh timer error Reseat the memory, or replace with
known good modules.
2 beeps
Parity error in base memory (first
64KB block)
3 beeps
Base memory read/write test error
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.
• Checks some basic system-board operations
• Checks the memory operation
• Starts the video operation
• Verifies that the boot drive is working
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.