Beep Codes - Dell OptiPlex 780 Ultra Small Form Factor Service Manual

Amber
Second state of the light at power up. Indicates the POWER_GOOD signal is active and it is probable that
the power supply is fine. Look at the diagnostic lights for further information.
Blinking
Green
System is in a low power state, either S1 or S3. Look at the diagnostic lights to determine which state the
system is in.
Solid
Green
System is in S0 state, the normal power state of a functioning machine.
The BIOS will turn the light to this state to indicate it has started fetching op-codes.

Beep Codes

If the monitor cannot display error messages during the POST, the computer may emit a series of beeps that identifies the
problem or that can help you identify a faulty component or assembly. The following table lists the beep codes that may
be generated during the POST. Most beep codes indicate a fatal error that prevents the computer from completing the
boot routine until the indicated condition is corrected.
Code
1-1-2
1-1-3
1-1-4
1-2-1
1-2-2
1-2-3
1-3
1-3-1 through 2-4-4 Memory not being properly identified or used
3-1-1
3-1-2
3-1-3
3-1-4
3-2-2
3-2-4
3-3-1
3-3-2
3-3-4
3-4-1
3-4-2
3-4-3
4-2-1
4-2-2
4-2-3
4-2-4
4-3-1
4-3-3
4-3-4
4-4-1
Cause
Microprocessor register failure
NVRAM read/write failure
ROM BIOS checksum failure
Programmable interval timer failure
DMA initialization failure
DMA page register read/write failure
Video Memory Test failure
Slave DMA register failure
Master DMA register failure
Master interrupt mask register failure
Slave interrupt mask register failure
Interrupt vector loading failure
Keyboard Controller Test failure
NVRAM power loss
Invalid NVRAM configuration
Video Memory Test failure
Screen initialization failure
Screen retrace failure
Search for video ROM failure
No timer tick
Shutdown failure
Gate A20 failure
Unexpected interrupt in protected mode
Memory failure above address 0FFFFh
Timer-chip counter 2 failure
Time-of-day clock stopped
Serial or parallel port test failure