What is the meaning of different BIOS beep codes during startup?
One short beep indicates VGA detected or quick boot disabled; one continuous beep followed by two short beeps (repeated) means no memory detected; one continuous beep followed by three short beeps means no VGA detected; and one continuous beep followed by four short beeps indicates a hardware component failure.
From the official ASUS Asus Prime Z390 A Motherboard User manual, page 61
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