Dell 745 manual Resolving Software and Hardware Incompatibilities, Code Cause

If your computer beeps during start-up:

1Write down the beep code.

2See "Dell Diagnostics" on page 46 to identify a more serious cause.

3Contact Dell for technical assistance. For information on contacting Dell, see your online User’s Guide.

Code	Cause	Code	Cause
1-1-2	Microprocessor register failure	3-1-4	Slave interrupt mask register failure
1-1-3	NVRAM read/write failure	3-2-2	Interrupt vector loading failure
1-1-4	ROM BIOS checksum failure	3-2-4	Keyboard Controller test failure
1-2-1	Programmable interval timer failure	3-3-1	NVRAM power loss
1-2-2	DMA initialization failure	3-3-2	Invalid NVRAM configuration
1-2-3	DMA page register read/write	3-3-4	Video Memory test failure
	failure
1-3	Video Memory test failure	3-4-1	Screen initialization failure
1-3-1 through 2-4-4	Memory not being properly	3-4-2	Screen retrace failure
	identified or used
3-1-1	Slave DMA register failure	3-4-3	Search for video ROM failure
3-1-2	Master DMA register failure	4-2-1	No timer tick
3-1-3	Master interrupt mask register	4-2-2	Shutdown failure
	failure
4-2-3	Gate A20 failure	4-4-1	Serial or parallel port test failure
4-2-4	Unexpected interrupt in protected	4-4-2	Failure to decompress code to
	mode		shadowed memory
4-3-1	Memory failure above address	4-4-3	Math-coprocessor test failure
	0FFFFh
4-3-3	Timer-chip counter 2 failure	4-4-4	Cache test failure
4-3-4	Time-of-day clock stopped

Resolving Software and Hardware Incompatibilities

If a device is either not detected during the operating system setup or is detected but incorrectly configured, you can use the Hardware Troubleshooter to resolve the incompatibility.

1Click the Start button and click Help and Support.

2Type hardware troubleshooter in the Search field and click the arrow to start the search.

Quick Reference Guide

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