Light Pattern
Problem Description Troubleshooting
Steps
Diagnostic LEDs Power Button LED
correct for the
devices
installed on your
computer.
Beep Codes
The computer 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 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
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