Dell PowerEdge T20 Owner's Manual

The system emits a series of beeps during startup if it detects no memory. The beep code pattern emitted is 1-3-2 (1 beep, then 3 beeps, then 2 beeps). The delay between each beep is 300 ms, the delay between each set of beeps is 3 secs, and the beep sound lasts 300 ms. Reseating the memory modules may fix the memory errors. After emitting beeps, the BIOS will detect if the user presses the power button and will execute the normal shutdown process and power the system off.