How to switch off the "bong" sound at startup or reduce volume?

[Gloor]

Hi,

I was wondering if there is a way to set the volume on the startup sound or if I can completely switch it off. I often turn on my computer in the morning when others sleep and its a bit annoying for them. I tried to plug in my headphones but the sound is still coming from the case so any ideas?

Thanks

 

[r.j.s]

Here you go

 

[Gloor]

Thank you very much