external hard drive won't show up in finder

My external hard drive (Samsung 1TB USB 3.0) no longer shows up in my finder, but it does show up in disk utility. When I click on First Aid, it says operation successful and doesn't find any errors. The mount button is faded and won't let me click it. I checked my finder preferences (general and sidebar) and external disks are checked on both, so they should be showing. Does anybody have any idea what's wrong/how I can fix this, preferably without fiddling about with the commands?