Power-On Self-Test; Table 3-3. Insyde Mobilepro Bios Post Beep Codes And Messages - HP Pavilion zt1100 Service Manual

Power-On Self-Test

The POST (Power-On Self-Test) is a series of initialization routines and diagnostic tests that the
system BIOS runs when the notebook boots. The system BIOS will not boot the operating system if
system memory, the CPU, DMA, or interrupt controller fails the POST diagnostic tests. POST
progress is indicated by a sequence of codes, and error messages are displayed if possible.
You should not necessarily interpret the failure of one or more POST tests as a hardware, software, or
firmware failure. If an error message appears, confirm the problem using other diagnostic tools. Not
all POST messages indicate a hardware, software, or firmware failure—some messages are for
information only.
First, confirm the failure by performing a "clean" boot, as described below: If the notebook fails to
restart with a clean boot, it requires repair.
1. Remove all accessories, including SDRAM modules, 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 switch to return the notebook to a known state.
If the BIOS detects a terminal error condition, it halts POST after issuing a terminal error beep code
and/or displaying a message (see the following table). The beep code indicates the POST routine in
which the terminal error occurred.
If the system fails after you make changes using the BIOS configuration utility, reset the notebook,
enter the BIOS configuration utility, and install the defaults or correct the error.

Table 3-3. Insyde MobilePRO BIOS POST Beep Codes and Messages

Beep Code Message
5 short, 1 long FAULTY DMA PAGE REGISTERS
4 short, 1 long, FAULTY REFRESH CIRCUIT
1 short
4 short, 2 long ROM CHECKSUM INCORRECT
3 short; 1 long, CMOS RAM TEST FAILED
2 short
3 short, 1 long, DMA CONTROLLER FAULTY
1 short, 1 long
3 short; 2 long, INTERRUPT CONTROLLER FAILED
1 short
3 short; 3 long (None)
2 short, 1 long; (None)
3 short
2 short, 1 long; (None)
2 short, 1 long
(None) KEYBOARD CONTROLLER FAILURE
(None) KEYBOARD FAILURE
(None) CMOS FAILURE - RUN SCU
(None) CMOS CHECKSUM INVALID - RUN SCU
HP Pavilion zt1100/xz100 Omnibook xt1000
Description
DMA page registers do not function properly.
RAM refresh circuit does not function properly.
BIOS ROM checksum failed.
CMOS RAM test failed.
DMA controller does not work properly.
Interrupt controller does not work properly.
Keyboard controller failed to respond to the self-
test command.
No video device found.
No RAM installed.
Keyboard controller failed during system inquiry
about connected devices.
Keyboard fails to respond or no keyboard is
connected.
CMOS data error, probably due to loss of battery
power.
CMOS checksum error.
Troubleshooting and Diagnostics 3-25