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APPENDIX B: SERVER HARDWARE TROUBLESHOOTING
Light Pattern
Problem Description
Troubleshooting Steps
Another failure has occurred.
Ensure that all hard drive and optical drive cables are properly connected to the
system board.
If there is an error message on the screen identifying a problem with a device
(such as the floppy drive or hard drive), check the device to make sure it is
functioning properly.
If the operating system is attempting to boot from a device (such as the floppy
drive or optical drive), check system setup to ensure the boot sequence is correct
for the devices installed on your computer.
If the problem persists, contact Dell
B.2 Dell Optiplex 790, Optiplex 990 hardware common error
indications
BEEP CODES
The system can emit a series of beeps during start-up if the display cannot show errors or problems. These series of beeps, called
beep codes, identify various problems. The delay between each beep is 300 ms, the delay between 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
Cause
1-1-2
Microprocessor register failure
1-1-3
NVRAM
1-1-4
ROM BIOS checksum failure
1-2-1
Programmable interval timer
1-2-2
DMA initialization failure
1-2-3
DMA page register read/write failure
1-3-1 through 2-4-4
DIMMs not being properly identified or used
3-1-1
Slave DMA register failure
3-1-2
Master DMA register failure
3-1-3
Master interrupt mask register failure
3-1-4
Slave interrupt mask register failure
3-2-2
Interrupt vector loading failure
3-2-4
Keyboard Controller Test failure
3-3-1
NVRAM power loss
3-3-2
NVRAM configuration
3-3-4
Video Memory Test failure
