HP ML150 HP ProLiant ML150 G6 Server Maintenance and Service Guide - Page 87

POST Related Troubleshooting, NMI button - post beep

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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 emits beep codes. If the POST fails during boot up (displays error messages, or emits beep codes), check the following: • All external cables and 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 cables are properly connected and all boards firmly seated. • The processor is fully seated in its socket on the system board. • The heat sink assembly is properly installed on top of the processor. • All memory modules are properly 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 server. 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 function requires support from the operating system (OS). CAUTION: The NMI button is for diagnostic purposes only and should never be pressed while the server is operating normally. 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. Diagnostic Tools and Setup Utilities 87

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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 emits beep
codes.
If the POST fails during boot up (displays error messages, or emits beep codes), check the following:
•
All external cables and 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 cables are properly connected and all boards firmly seated.
•
The processor is fully seated in its socket on the system board.
•
The heat sink assembly is properly installed on top of the processor.
•
All memory modules are properly 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 server.
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 function requires support from the operating system (OS).
CAUTION:
The NMI button is for diagnostic purposes only and should never be pressed while the
server is operating normally.
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.
Diagnostic Tools and Setup Utilities
87