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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.
2.
3.
4.
Remove all accessories, including SDRAM modules, port replicator, PC cards, printer, external
monitor, pointing device, and keyboard.
Provide “clean” AC power—no auto adapter or unusual AC adapter configuration.
Press the reset button to return the notebook to a known state.
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.
Table 3-4. POST Terminal-Error Beep Codes
Beep Codes* POST Description
1 One short beep before boot.
1-2 Search for option ROMs.
1-1-1-3 Verify Real Mode.
1-1-1-4 Disable Non-Maskable Interrupt (NMI).
1-1-2-1 Get CPU type.
1-1-2-3 Initialize system hardware.
1-1-2-4 Disable shadow and execute code from ROM.
1-1-3-1 Initialize chipset with initial POST values.
1-1-3-2 Set IN POST flag.
1-1-3-3 Initialize CPU registers.
1-1-3-4 Enable CPU cache.
1-1-4-1 Initialize caches to initial POST values.
1-1-4-3 Initialize I/O component.
1-1-4-4 Initialize local bus IDE.
1-2-1-1 Initialize Power Management.
1-2-1-2 Load alternate registers with initial POST values.
1-2-1-3 Restore CPU control word during warm boot.
1-2-1-4 Initialize PCI Bus Mastering devices.
1-2-2-1 Initialize keyboard controller.
1-2-2-3 BIOS ROM checksum.
1-2-2-4 Initialize cache before memory Auto size.
1-2-3-1 8254 timer initialization.
1-2-3-3 8237 DMA controller initialization.
1-2-4-1 Reset Programmable Interrupt Controller.
1-3-1-1 Test DRAM refresh.
1-3-1-3 Test 8742 Keyboard Controller (on motherboard).
1-3-2-1 Set ES segment register to 4 GB.
1-3-3-1 Auto size DRAM; or wrong type or no RAM installed.
1-3-3-2 Initialize POST Memory Manager.
1-3-3-3 Clear 512 kB base RAM.
1-3-4-1 RAM failure on address line xxxx.
1-3-4-3 RAM failure on data bits xxxx of low byte of memory bus.
1-3-4-4 Enable cache before system BIOS shadow.
1-4-1-1 RAM failure on data bits xxxx of high byte of memory bus.
1-4-1-3 Test CPU bus-clock frequency.
1-4-1-4 Initialize Phoenix Dispatch Manager.
1-4-2-3 Warm start shut down.
1-4-3-1 Shadow system BIOS ROM.
1-4-3-3 Auto size cache.
1-4-4-1 Advanced configuration of chipset registers.
1-4-4-2 Load alternate registers with CMOS values.
2-1-1-2 Initialize extended memory for ROMPilot.
2-1-1-3 Initialize interrupt vectors.
2-1-2-2 POST device initialization.
2-1-2-3 Check ROM copyright notice.
2-1-2-4 Initialize I20 support.
2-1-3-1 Check video configuration against CMOS.
2-1-3-2 Initialize PCI bus and devices.
2-1-3-3 Initialize all video adapters in system.
2-1-3-4 QuietBoot start (optional).
2-1-4-1 Shadow video BIOS ROM.
3-20 Troubleshooting and Diagnostics Service Manual