Acer 4520 manual Post Beep Codes

	Error Message				FRU/Action in Sequence
	No beep, power indicator turns on, the LCD			Reconnect the LCD-CCD cable.
	screen is blank, but you can view POST			LCD-CCD cable
	when connected to an external CRT.			Inverter board
				LCD panel
				System board
	No beep, power indicator turns on and a			Ensure every internal cables are properly and securely
	blinking cursor appears on screen during			connected.
	POST.			System board
	No beep during POST but system runs			Speaker
	correctly.			System board
POST Beep Codes
	Code		Beeps		POST Routine Description
	02h				Verify Real Mode
	03h				Disable Non-Maskable Interrupt (NMI)
	04h				Get CPU type
	06h				Initialize system hardware
	08h				Initialize chipset with initial POST values
	09h				Set IN POST flag
	0Ah				Initialize CPU registers
	0Bh				Enable CPU cache
	0Ch				Initialize caches to initial POST values
	0Eh				Initialize I/O component
	0Fh				Initialize the local bus IDE
	10h				Initialize Power Management
	11h				Load alternate registers with initial POST
					values
	12h				Restore CPU control word during warm
					boot
	13h				Initialize PCI Bus Mastering devices
	14h				Initialize keyboard controller
	16h	1-2-2-3			BIOS ROM checksum
	17h				Initialize cache before memory autosize
	18h				8254 timer initialization
	1Ah				8237 DMA controller initialization
	1Ch				Reset Programmable Interrupt Controller
	20h	1-3-1-1			Test DRAM refresh
	22h	1-3-1-3			Test 8742 Keyboard Controller
	24h				Set ES segment register to 4 GB
	26h				Enable A20 line
	28h				Autosize DRAM
	29h				Initialize POST Memory Manager
	2Ah				Clear 215 KB base RAM
	2Ch	1-3-4-1			RAM failure on address line xxxx

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