Dell Optiplex 780 DT Beep Codes

Upon boot, your computer might emit a series of beeps that identify a problem: for example, one beep, followed by a a burst of three beeps, and then one beep (code 1-3-1) means that the computer encountered a memory problem.

Try to resolve the problem— Write the beep code down on the Diagnostics Checklist, and perform the action recommended in the following table.
Run the Dell Diagnostics to identify a more serious cause.
Code Cause Action
1-1-2 Microprocessor register failure Contact Dell for technical assistance.
1-1-3 NVRAM Run the Dell Diagnostics.
1-1-4 ROM BIOS checksum failure Run the Dell Diagnostics.
1-2-1 Programmable interval timer Run the Dell Diagnostics.
1-2-2 DMA initialization failure Run the Dell Diagnostics.
1-2-3 DMA page register read/write failure Run the Dell Diagnostics.
1-3-1 through 2-4-4 DIMMs not being properly identified or used See “Memory Problems.”
3-1-1 Slave DMA register failure Run the Dell Diagnostics.
3-1-2 Master DMA register failure Run the Dell Diagnostics.
3-1-3 Master interrupt mask register failure Contact Dell for technical assistance.
3-1-4 Slave interrupt mask register failure Contact Dell for technical assistance.
3-2-2 Interrupt vector loading failure Contact Dell for technical assistance.
3-2-4 Keyboard Controller Test failure Run the Dell Diagnostics.
3-3-1 NVRAM power loss Run the Dell Diagnostics.
3-3-2 NVRAM configuration Run the Dell Diagnostics.
3-3-4 Video Memory Test failure Run the Dell Diagnostics.
3-4-1 Screen initialization failure Run the Dell Diagnostics.
3-4-2 Screen retrace failure Run the Dell Diagnostics.
3-4-3 Search for video ROM failure Run the Dell Diagnostics.
4-2-1 No time tick Contact Dell for technical assistance.
4-2-2 Shutdown failure Contact Dell for technical assistance.
4-2-3 Gate A20 failure Contact Dell for technical assistance.
4-2-4 Unexpected interrupt in protected mode Contact Dell for technical assistance.
4-3-1 Memory failure above address 0FFFFh Run the Dell Diagnostics.
4-3-3 Timer-chip counter 2 failure Contact Dell for technical assistance.
4-3-4 Time-of-day clock stopped Contact Dell for technical assistance.
4-4-1 Serial or parallel port test failure Run the Dell Diagnostics.
4-4-4 Cache test failure Run the Dell Diagnostics.