Well the keyboard obviously works as Peter managed to type the text of the post into some other app. It’s not possible for there to be a keyboard driver problem.
It sounds like Peter is using a _web browser_ (which one?) that is mis-behaving, in that keypresses are ignored or no displayed text appears in the web browser when one would expect it to.
Peter, does Alt+TAB work? -Hold down the Alt key and tap the Tab key
or Ctrl+Alt-Esc ? - hold down both Alt and Ctrl key and tap the Esc key