Dell T5500 specifications System Beep Codes Description

	1- Off
S5	2- Solid	VID	Video Card	Video subsystem configuration activity in progress or video subsystem failure.
	3- Off
	4- Solid
	1- Off
S6	2- Solid	STO	Storage	Storage device configuration in progress or storage subsystem failure.
	3- Solid
	4- Off
	1- Off
S7	2- Solid	USB	USB	USB subsystem configuration activity in progress or USB subsystem failure.
	3- Solid
	4- Solid
	1- Solid
S8	2- Off	MEM	Memory	Memory subsystem configuration activity is in progress. No memory modules were
	3- Off			detected.
	4- Off
	1- Solid
S9	2- Off	MBF	System board	Fatal system board failure detected.
	3- Off
	4- Solid
	1- Solid
S10	2- Off	MEM	Memory	Memory subsystem configuration activity is in progress. Memory modules have
	3- Solid			been detected but appear to be incompatible or in an invalid configuration.
	4- Off
	1- Solid
S11	2- Off	PRV	Other pre-video	Indicates routine system activity preceding video initialization.
	3- Solid		activity
	4- Solid
	1- Solid
S12	2- Solid	CFG	Resource	System resource configuration in progress.
	3- Off		configuration
	4- Off
	1- Solid
S13	2- Solid		Reserved	Reserved for future use. This pattern is being considered to indicate the Visual Off
	3- Off			state on the Dimension systems.
	4- Solid
	1- Solid
S14	2- Solid	POV	Other post-video	Indicates routine system activity subsequent to video initialization.
	3- Solid		activity
	4- Off
	1- Solid			Indicates End of POST process. Lights are normally in this state briefly as POST
	2- Solid
S15		STD	Boot hand off	completes. Once the hand-off to the OS is done, the lights turn off and transition
	3- Solid
				to S0e state.
	4- Solid

Beep Codes

When errors occur during a boot routine that cannot be reported on the monitor, the computer may emit a beep code that identifies the problem. The beep code is a pattern of sounds: for example, one beep followed by a second beep, then followed by a burst of three beeps (code 1-1-3) means that the computer was unable to read the data in nonvolatile random-access memory (NVRAM). If the system loses power and beeps constantly when you turn it back on, the BIOS is probably corrupted.

System Beep Codes

Beep	Description	Beep	Description
Code		Code
1-1-2	CPU register test in progress	2-4-3	1st 64 K RAM chip or data line failure - bit E
1-1-3	CMOS read/write test in progress or failure	2-4-4	1st 64 K RAM chip or data line failure - bit F
1-1-4	BIOS ROM checksum in progress or failure	3-1-1	Slave DMA register test in progress or failure
1-2-1	Timer Test in progress or failure	3-1-2	Master DMA register test in progress or failure
1-2-2	DMA initialization in progress or failure	3-1-3	Master IMR test in progress or failure
1-2-3	DMA page register read/write test in	3-1-4	Slave IMR test in progress or failure
	progress or failure
1-3-1	RAM refresh verification in progress or failure	3-2-2	Interrupt vector loading in progress
1-3-2	1st 64 K RAM test in progress or failure	3-2-4	Keyboard controller test in progress or failure
1-3-3	1st 64 K RAM chip or data line failure (multi	3-3-1	CMOS power fail and checksum test in
	bit)		progress
1-3-4	1st 64 K RAM odd/even logic failure	3-3-2	CMOS Config info validation in progress
1-4-1	1st 64 K RAM address line failure	3-3-3	RTC/Keyboard controller not found
1-4-2	1st 64 K RAM parity test in progress or failure	3-3-4	Screen memory test in progress or failure
1-4-3	Fail-safe timer test in progress	3-4-1	Screen initialization test in progress or failure
1-4-4	Software NMI port test in progress	3-4-2	Screen retrace tests test in progress or failure
2-1-1	1st 64 K RAM chip or data line failure - bit 0	3-4-3	Search for video ROM in progress
2-1-2	1st 64 K RAM chip or data line failure - bit 1	4-2-1	Timer tick interrupt test in progress or failure
2-1-3	1st 64 K RAM chip or data line failure - bit 2	4-2-2	Shutdown test in progress or failure
2-1-4	1st 64 K RAM chip or data line failure - bit 3	4-2-3	Gate A20 failure