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• If the operating system is attempting to boot from a device (optical drive), check
system setup to ensure the boot sequence is 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
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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