Dell OptiPlex 390 Owners Manual - Page 75
each set of beeps is 3 sec, and the beep sound lasts 300 ms. After each beep
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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 Cause 1-1-2 Microprocessor register failure Code Cause 1-1-3 NVRAM Code Cause 1-1-4 ROM BIOS checksum failure Code Cause 1-2-1 Programmable interval timer Code Cause 1-2-2 DMA initialization failure Code Cause 1-2-3 DMA page register read/write failure Code Cause 1-3-1 through 2-4-4 DIMMs not being properly identified or used Code Cause 3-1-1 Slave DMA register failure Code Cause 3-1-2 Master DMA register failure Code Cause 3-1-3 Master interrupt mask register failure Code Cause 3-1-4 Slave interrupt mask register failure 75