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
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