Diagnostic Tools and Setup Utilities 94
POST Related Troubleshooting
The POST is an important routine that checks the basic functions of the server during the boot process.
Perform the following procedures when POST fails to run, displays error messages, or emit s beep
codes.
If the POST fails durin g boot up (displays error messages, or emits beep codes), check the follow ing:
• All external cab les a n d power cables should be firmly plugged in.
• The power outlet to which the server is connected and is working.
• The server and monitor are both turned on. The bi-color status LED indicator on the front panel
must be lit up green.
• The monitor's contrast and brightness settings are correct.
• All internal cab l es ar e p roperly connected and all boards firmly seated.
• The processor is fully seate d in its socket on the system board.
• The hea tsink assembly is properly installed on top o f the processor.
• All memory modules a r e p roperly installed.
• If you have installed a PCI accessory board, verify that the board is firmly seated and any
switches or jumpers on the board are properly set. Refer to the documentation provided with the
accessory board.
• All internal cabling and connections are in their proper order.
• Verify that each switch on the system board is properly set, especially if any switch positions
have been changed prior to booting the serv er.
NMI button
The system board has a Non-Maskable Interrupt (NMI) button (SW3) that provides a diagnostic
function when the server is in an unrecoverable state (locked up or “hung”). The NMI button, when
pressed, allows a memory dump to be performed and crash dump files to be created before a hard
reset (power cycle) is performed. This fun cti on requires sup port from the operating system (O S).
CAUTION: The NMI button is f or diagnostic purp oses only and should never be pressed while the
server is opera t in g n or m ally. Pressing this button while the server is in normal operation will cause
the system to halt immediately.
NOTE: The NMI button may not work in some situations, such as if an NMI has already occurred or
if the OS crash handler is unable to run properly.
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