ProLiant DL140 Generation 2 Server Maintenance and Service Guide

Diagnostic tools 50
POST beep codes
The POST routines cannot display messages when an error occurs if any of the following are present:
• The error occurs before the video display is initialized.
• The video configuration fails, either there’s no graphics card installed or the one installed is faulty.
• An external ROM module does not properly checksum to zero.
• The system memory cannot be initialized.
During these instances the server unit emits a buzzing sound followed by a series of audible beeps. An external
ROM module (e.g. VGA) can also issue audible errors, usually consisting of one long tone followed by a series
of short tones. If you get a blank screen on boot, but hear beeps, count the beeps and refer to the following table
for their corresponding meaning. If you miss the beep code:
1. Turn off the server by pressing the power button for five seconds or more.
2. Restart the server by pressing the power button.
3. Listen for the signal again.
The routine derives the beep code from the test point error as follows:
1. The 8-bit error code is broken down to four 2-bit groups (Discard the most significant group if it is 00).
2. Each group is made one-based (1 through 4) by adding 1.
3. Short beeps are generated for the number in each group.
Example:
Test point 01Ah = 00 01 10 10 = 1-2-3-3 beeps
Table 6 lists the checkpoint codes written at the start of each test and the beep codes issued for terminal errors.
Table 6 POST beep codes
Code Beep Description
02h Verify real mode
03h Disable non-maskable interrupts
04h Get processor type
06h Initialize system hardware
07h Disable shadow and execute code from the ROM
08h Initialize chipset with initial POST values
09h Set IN POST flag
0Ah Initialize processor registers
0Bh Enable processor cache
0Ch Initialize caches to initial POST values
0Eh Initialize I/O component
0Fh Initialize the local bus IDE
10h Initialize power management
11h Load alternate registers with initial POST values
12h Restore processor control word during warm boot
13h Initialize PCI bus mastering devices
14h Initialize keyboard controller
16h 1-2-2-3 BIOS ROM checksum
17h Initialize cache before memory auto size
18h 8254 timer initialization
1Ah 8237 DMA controller initialization
1Ch Reset programmable interrupt controller
20h 1-3-1-1 Test DRAM refresh