In addition to the answer below, I suspect it's just a blown fuse. If you look at this glass tube, can you see a fine wire inside? The wire will be intact if the fuse is good, otherwise if the wire is missing or there are little bits floating about inside the glass you will need to change it. The fuse rating will be stamped in small letters on the metal end cap, use these to source the correct fuse and simply replace.
There will, of course, be a reason why this fuse blew and that issue will need addressing too.
Rupert, June 2020