Table 3-4. Post Terminal-Error Beep Codes - HP Compaq Evo N1010v Series Service Manual

Power-On Self-Test
NOTE: If Quiet Boot is enabled in BIOS Setup (the default setting), press
POST messages.
When the notebook boots, its system BIOS runs a series of initialization routines and diagnostic tests
called POST (Power-On Self-Test). The BIOS will not boot the notebook's operating system if the system
memory, CPU, DMA, or interrupt controller fails the POST diagnostic tests. POST indicates progress
by a sequence of codes; if an error occurs, the BIOS displays a message and/or issues a beep code.
Note that not all POST messages indicate a failure in the notebook—some messages are for information
only. You should not necessarily interpret the failure of one or more POST tests as a hardware, software,
or firmware failure. If POST displays an error message or issues a beep code indicating an error, confirm the
problem using other diagnostic tools.
First, confirm the failure by performing a "clean" boot, as described below. Note that if the notebook
fails to restart with a clean boot, it requires repair.
1. Remove all accessories, including SDRAM modules, port replicator, PC cards, printer, external
monitor, pointing device, and keyboard.
2. Provide "clean" AC power—no auto adapter or unusual AC adapter configuration.
3. Press the reset button to return the notebook to a known state.
4. Press the power button to start the notebook.
If the BIOS detects a terminal error condition, it halts POST after issuing a beep code and/or displaying
a message (see the following table). The beep code indicates the POST routine in which the terminal
error occurred.
Beep Codes
1
1-2
1-1-1-3
1-1-1-4
1-1-2-1
1-1-2-3
1-1-2-4
1-1-3-1
1-1-3-2
1-1-3-3
1-1-3-4
1-1-4-1
1-1-4-3
1-1-4-4
1-2-1-1
3-22 Troubleshooting and Diagnostics

Table 3-4. POST Terminal-Error Beep Codes

POST Description
One short beep before boot
Search for option ROMs
Verify Real Mode
Disable Non-Maskable Interrupt (NMI)
Get CPU type
Initialize system hardware
Disable shadow and execute code from ROM
Initialize chipset with initial POST values
Set IN POST flag
Initialize CPU registers
Enable CPU cache
Initialize caches to initial POST values
Initialize I/O component
Initialize local bus IDE
Initialize Power Management
during boot to see
esc
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