[Vivobook Flip 14 (2025)] When hibernating, it makes a 3-second buzzing sound

[extremeMind]

Hello everyone,
I have a 2025 Vivobook Flip 14, and when I put it into hibernation or shut it down with fast reboot enabled (which uses hibernation), it makes a faint buzzing sound after the screen turns off. This sound doesn’t come from the speakers. However, if I disable fast reboot, the sound stops.
Is this normal?
Thanks for your attention.

[extremeMind · Accepted solution]

According to ASUS support, this is normal and caused by the power transition on the motherboard.