Acer Aspire 4732Z Acer Aspire 4332, Aspire 4732Z Series Service Guide - Page 67

POST Beep Codes When no POST error message is displayed but the computer stops during POST, listen for beep codes. Code 02h 03h 04h 06h 08h 09h 0Ah 0Bh 0Ch 0Eh 0Fh 10h 11h 12h 13h 14h 16h 17h 18h 1Ah 1Ch 20h 22h 24h 26h 28h 29h 2Ah 2Ch 2Eh 2Fh 30h 32h 33h 36h 38h 3Ah 3Ch 3Dh 42h Beeps 1-2-2-3 1-3-1-1 1-3-1-3 1-3-4-1 1-3-4-3 1-4-1-1 POST Routine Description Verify Real Mode Disable Non-Maskable Interrupt (NMI) Get CPU type Initialize system hardware 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 the local bus IDE Initialize Power Management Load alternate registers with initial POST values Restore CPU control word during warm boot Initialize PCI Bus Mastering devices Initialize keyboard controller BIOS ROM checksum Initialize cache before memory autosize 8254 timer initialization 8237 DMA controller initialization Reset Programmable Interrupt Controller Test DRAM refresh Test 8742 Keyboard Controller Set ES segment register to 4 GB Enable A20 line Autosize DRAM Initialize POST Memory Manager Clear 215 KB base RAM RAM failure on address line xxxx* RAM failure on data bits xxxx* of low byte of memory bus Enable cache before system BIOS shadow RAM failure on data bits xxxx* of high byte of memory bus Test CPU bus-clock frequency Initialize Phoenix Dispatch Manager Warm start shut down Shadow system BIOS ROM Autosize cache Advanced configuration of chipset registers Load alternate registers with CMOS values Initialize interrupt vectors Acer Aspire 4732Z/4332 Service Guide 59