indicates successful POST) Basically it is the response to your ping on the power button, "Hello?", "Yes, Hello! I have power and my basic hardware is functional."
So typically, the computer makes a "beep" only after it has tested and loaded the most-basic-of-the-basics that make it possible for it to "beep". POST does a lot of simple things very quickly to test itself (this is all in BIOS so it's actually the motherboard firmware testing itself, and its associated components like processor and memory) like loading basic hardware drivers to talk with other components, and verifying that its own hardware such as the speaker works with a quick beep.MIDI (Talking about the speaker on the motherboard itself here, not the auxiliary speakers you plug in to the back.) Think of it like debugging: if you can't tell why your script isn't working or where, it helps to have it echoing its status along the way in a very verbose manner so it becomes apparent where the issue is. Beeps during POST are there to help with troubleshooting.
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