Topmusicanswers
If the key moves freely and returns to its correct height without problem but still does not sound, the issue may be with an internal part that has failed. A string might be broken, a piano hammer might be cracked or missing, or a foreign object might be resting against the string.
What is a dead key on a piano?
A dead key is a special kind of a modifier key on a mechanical typewriter, or computer keyboard, that is typically used to attach a specific diacritic to a base letter. The dead key does not generate a (complete) character by itself, but modifies the character generated by the key struck immediately after.
How much does it cost to fix a dead key on a piano?
Sticking keys is one of the most common problems pianists face. Most of the time, it's an easy and inexpensive fix. It only becomes expensive if a broken mechanism is causing it. Fixing sluggish keys can cost anywhere from $15 to $50.
