Originally Posted by SFO_FT
this works!!
This one came from one of the users on the ThinkPad Mailing List and it's a very welcomed fix! There are a number of key combinations that cause a ThinkPad to beep at seemingly random times. For example, if you hold down W E and R there's no beep, but if you hold down T Y and U the machine beeps at you (and really has no reason to).
The fix - thanks Deanna! - is simple. Go to Device Manager and "Show Hidden Devices". Under "Non-Plug and Play Drivers" you'll see an item named "Beep". Disable that and the "random beep" disappears. Once done, of course, you can hide the hidden devices again.
That may fix one kind of random beeping, but not another kind, because mine still beeps (seldom, but every now and then) after making that change.