Just to clarify: you installed a small speaker because the motherboard does not have a speaker - correct?
Motherboard link:
https://download.gigabyte.com/FileList/Manual/mb_manual_b550-aorus-pro-ac_1001_e.pdf
Referencing the internal connectors 13 & 14 (Page 20 of the User Manual)
Where did you get the speaker and how/where/ how did you connect the speaker?
What instructions or documentation did you use to install the speaker?
I will see if I can disable it in the BIOS. ThanksAnother late thought: Looked at the User Manual again - reference Page 30:
"HD Audio ControllerEnables or disables the onboard audio function. (Default: Enabled)If you wish to install a 3rd party add-in audio card instead of using the onboard audio, set this item to Disabled "
Setting?