For reference, specifically, this would be indicative of an alarm on the motherboard.
The only typical alarm of this nature would be an overtemperature alarm, either for chassis or (more typically) CPU temperature.
In this case, it sounds like the CPU fan was failing, causing the CPU to overheat; once the threshhold temperature was reached (BIOS configurable), the alarm sounded.
Remember, boys and girls, if your computer is making a sound like an ambulance, there's probably something bad going on.
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Alright, this sounds like the board was DOA (Dead on Arrival). Unfortunately it sounds like you will have to contact ASUS and request an RMA or a refund. This has been happening more often with ASUS products recently and is definitely a pain.
Dual-tone siren meaning - hardware monitoring signalyzed that some problems with mobo, to ex.: - any Voltage (CPU, RAM, chipset etc) is bad - any Temperature (from any sensor) is bad - frequency of cooler is bad (or not connected)