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Service Manual Troubleshooting and Diagnostics 3-23
Beep Codes POST Description
3-4-3-2 Prepare Boot
3-4-3-3 Initialize SMBIOS
3-4-3-4 Initialize PnP Option ROMs
3-4-4-1 Clear parity checkers
3-4-4-2 Display MultiBoot menu
3-4-4-3 Clear screen (optional)
3-4-4-4 Check virus and backup reminders
4-1-1-1 Try to boot with INT 19
4-1-1-2 Initialize POST Error Manager (PEM)
4-1-1-3 Initialize error logging
4-1-1-4 Initialize error display function
4-1-2-1 Initialize system error handler
4-1-2-2 PnPnd dual CMOS (optional)
4-1-2-3 Initialize note dock (optional)
4-1-2-4 Initialize note dock late
4-1-3-1 Force check (optional)
4-1-3-2 Extended checksum (optional)
4-1-3-3 Redirect Int 15h to enable remote keyboard
4-1-3-4 Redirect Int 13h to Memory Technologies Devices such as ROM, RAM, PCMCIA, and serial disk
4-1-4-1 Redirect Int 10h to enable remote serial video
4-1-4-2 Re-map I/O and memory for PCMCIA
4-1-4-3 Initialize digitizer and display message
4-2-1-3 Unknown interrupt
4-3-1-1 Initialize the chipset
4-3-1-2 Initialize the bridge
4-3-1-3 Initialize the CPU
4-3-1-4 Initialize system timer
4-3-2-1 Initialize system I/O
4-3-2-2 Check force recovery boot
4-3-2-3 Checksum BIOS ROM
4-3-2-4 Go to BIOS
4-3-3-1 Set Huge Segment
4-3-3-2 Initialize Multi Processor
4-3-3-3 Initialize OEM special code
4-3-3-4 Initialize PIC and DMA
4-3-4-1 Initialize Memory type
4-3-4-2 Initialize Memory size
4-3-4-3 Shadow Boot Block
4-3-4-4 System memory test
4-4-1-1 Initialize interrupt vectors
4-4-1-2 Initialize Run Time Clock
4-4-1-3 Initialize video
4-4-1-4 Initialize System Management Manager
4-4-2-1 Output one beep
4-4-2-2 Clear Huge Segment
4-4-2-3 Boot to Mini DOS
4-4-2-4 Boot to Full DOS
1 long,
2 short
Improper video configuration (reprogram EEPROM) or external ROM checksum failure