Windows 11 Strange beep after windows start-up ASUS ZPrime Mobo

That beep is almost certainly not the Windows “startup sound” (the .wav), which is why turning off “Play Windows startup sound” doesn’t affect it. On Asus boards it’s usually coming from either:
1) the motherboard/UEFI “system speaker / POST / Q‑Code / hardware monitor” beeper, or
2) a Windows “Default Beep” event (a system beep generated by Windows when something triggers it, not the startup .wav).
A quick way to tell which one it is:

1) Does it happen in BIOS / before Windows loads?​

• If you hear it before the Windows spinning dots/logo (or you can reproduce it by sitting in BIOS), it’s 100% motherboard/UEFI.
• If it happens only once you’re at the Windows login/desktop, it could be a Windows “default beep” or a driver/app.

2) Fast isolation tests (takes 2–3 minutes)​

Test A — Boot into Safe Mode​

If the beep still happens in Safe Mode, it’s less likely to be a startup app and more likely BIOS/firmware/hardware monitoring (or a very low-level driver).

Test B — Mute Windows audio vs. physical speaker​

• If you mute Windows sound and the beep still plays, it’s probably the motherboard speaker/buzzer (or UEFI beep).
• If muting Windows sound stops it, it’s a Windows-generated beep.

3) If it’s the motherboard/UEFI beeper (very common on Asus)​

On Asus boards this can be caused by:

• Hardware Monitor warnings (CPU fan low / fan not detected / AIO pump header, etc.)
• USB / keyboard initialization beeps
• Some UEFI options that “chirp” on certain events (depends on model)

What to do:

1. Enter BIOS/UEFI and look in Monitor / Q-Fan / Hardware Monitor:
   • Check CPU_FAN speed is detected and above the low limit.
   • If you use an AIO, make sure the pump is on the right header and the fan warning is configured appropriately.
2. Look for settings like “POST beep / system speaker / boot beep” (wording varies by Asus model).
3. If you have any overclock, revert to defaults and test once (some boards beep on training/instability).
4. Update the BIOS if you’re very far behind (optional, but can fix odd boot behaviors).

(General guidance on beeps potentially being firmware/hardware related matches what’s typically advised: if disabling the OS “speaker” doesn’t stop it, it points away from Windows and toward BIOS/board behavior. )

4) If it’s a Windows “Default Beep” (not the startup .wav)​

Windows can emit a “default beep” for certain events (device connect issues, blocked key combos, accessibility features, driver/app errors).
Try:

1. Control Panel → Sound → Sounds tab
   • Set Sound Scheme to “Windows Default”
   • Find “Default Beep” and set it to (None)
2. Check Device Manager for problem devices (especially USB and audio).
3. Check Event Viewer around the time of the beep (some people have found driver/timeouts correlate with odd startup behavior).

Important note about your RAR/video​

I can see you uploaded strange_beep_ausus_zprime.rar, but in this chat environment I’m not currently able to extract/play the video/audio from that RAR (it shows as a binary RAR only). So I can’t “listen” to it directly here.

5) Two questions that let me pinpoint it​

Reply with these and I’ll tell you the most likely cause + exact setting to change:
1) Exact motherboard model (example: “ASUS PRIME Z390-A”, “PRIME Z690-P”, etc.) and Windows version (10/11).
2) Does the beep happen before Windows loads, or only once you’re at the login/desktop?
If you can also describe it as “single short beep” vs multiple beeps / long+short pattern, that helps too (those patterns often map to firmware warnings).