I have a keyboard that probably has some sort of chametz stuck under the keys. Should I buy a new one for Pesach?
You do not have to buy new one for Pesach, try to clean the keyboard of any visible chometz, and you do not have to worry about a few crumbs that might have fallen inside the keyboard. This is because it is only a minute amount, and you are not going to come to eat.
M:B 242-33, Chayei Adam 119-6.