Dell OptiPlex 990 (Early 2011) User Manual

Page 73

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each set of beeps is 3 sec, and the beep sound lasts 300 ms. After each beep

and each set of beeps, the BIOS should detect if the user presses the power

button. If so, BIOS will jump out from looping and execute the normal shutdown

process and power system.

Code

1-1-2

Cause

Microprocessor register failure

Code

1-1-3

Cause

NVRAM

Code

1-1-4

Cause

ROM BIOS checksum failure

Code

1-2-1

Cause

Programmable interval timer

Code

1-2-2

Cause

DMA initialization failure

Code

1-2-3

Cause

DMA page register read/write failure

Code

1-3-1 through 2-4-4

Cause

DIMMs not being properly identified or used

Code

3-1-1

Cause

Slave DMA register failure

Code

3-1-2

Cause

Master DMA register failure

Code

3-1-3

Cause

Master interrupt mask register failure

Code

3-1-4

Cause

Slave interrupt mask register failure