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Are you talking about the pc speaker beep? If so, open your case, and unplug the PC speaker from the mother board, it won't do anything else to your system other then get rid of the starting beep. You can still play your music, and your sound will still function properly.
The system will give beep codes to let you know if it is working or not. There are so many beeps for video problems, memory, and so on. You don't need the pc speaker until you have a problem, then just plug it back in for an easier time diagnosing.
Distribution: Slackware, (Non-Linux: Solaris 7,8,9; OSX; BeOS)
It really depends on the beep you are talking about. If it's the beep when the system boots, turn the volume down until you need to hear things. If it's a problem while you are working, and you are using a desktop environment like KDE or Gnome, or just about any window manager, you can usually disable the warning beeps within the configuration tool for that WM/DE. If you are using the console, you can usually disable the beep by putting the following in your setup scripts: "set nobeep".
Your only choice for disabling the beap (unless you can change code and fix it) if your CMOS don't have it is to unsolder the beaper from inside your laptop. This is dangerous and is not advised, but if you pull it off, you just won't have any beeps unless you're under KDE or something. You can't take the system bell out of your kernel? Maybe you can change it under Kontrol Center... Dunno though...
Many laptops (except the Stone-Aged ones) have a Fn+F? key combination that handles the PC-speaker volume. Maybe you can beat that key combination a few times, and each time, you should hear a beep. Do it until you get the beep the volume you like. I've often seen this on an F4 or F6 key, and it will either say "speaker" or have a symbol of a speaker somewhere on the key (sometimes the front side), and a lot of times the label will be blue in color. Your laptop often will remember this setting between boot to boot unless you change it in CMOS (and often there is no option to do that, so it usually just remembers the last volume you had it at). I've seen this option in CMOS before!