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Chapter 5. Solving problems
POST beep code descriptions
Beep code
No beep
Call for service.
Continuous
If no video appears, the startup microprocessor failed. Verify that the startup microprocessor is
installed correctly. If it is, replace the startup microprocessor. If the problem persists, call for
service.
One short
POST completed successfully. One beep also occurs after POST if you enter an incorrect password.
Two short
Follow the instructions that appear on the screen.
Three short
POST detected a system memory error. Verify that the memory is installed correctly. If it is, replace
the failing memory module.
Attention: In some memory configurations, the 3-3-3 beep code might sound during POST
followed by a blank display screen. If this occurs and the Boot Fail Count feature in the Start
Options of the Configuration/Setup Utility is set to Enabled (its default setting), you must restart
the server three times to force the system BIOS to reset the memory connector or bank of
connectors from Disabled to Enabled.
Repeating
The system board might contain a failing component.
short
1.
Verify that the keyboard and pointing devices are connected properly.
2.
Ensure that nothing is resting on the keyboard.
3.
Disconnect the pointing device; then, restart the server. If the problem goes away, replace the
pointing device. If the problem remains, call for service.
One long and
If the video controller on the system board is being used, call for service. If you installed an
one short
optional video adapter, replace the failing adapter
One long and
A video I/O adapter ROM is not readable, or the video subsystem is defective. If you installed an
two short
optional video adapter, replace the failing adapter. If the problem remains, call for service.
One long and
The system-board video subsystem has not detected a monitor connection to the server. Ensure
three short
that the monitor is connected to the server. If the problem persists, replace the monitor.
© Copyright IBM Corp. 2001
This section provides basic troubleshooting information to help you resolve some
common problems that might occur while setting up your server.
If you cannot locate and correct the problem using the information in this section, see
the " Solving problems" section on the xSeries Documentation CD and the "Server
Support" flowchart in the front of this booklet.
POST emits one beep to signal successful completion. If POST detects a problem
during startup, other beep codes might occur. You can use the following beep code
descriptions to help identify and resolve problems that are detected during startup.
Note: See the "Solving problems" section of the User's Reference on the xSeries
Documentation CD for more information about the POST beep codes.
Table 3. POST beep code descriptions.
Descriptions of the POST beep codes
23
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