.
You could unplug the speaker. 
But (IMHO) I'd suggest leaving the speaker as is. If there is a system/hardware problem at start-up, that annoying speaker might/will actually be the first indicator to tell you that you have a problem.
.
You could unplug the speaker.
But (IMHO) I'd suggest leaving the speaker as is. If there is a system/hardware problem at start-up, that annoying speaker might/will actually be the first indicator to tell you that you have a problem.