Why can't I hear anything even though I’m logged into the online seminar? 25 June 2021 12:49 Updated Kindly check whether the speakers on your PC / Mac are switched on or whether you may need to plug in headphones. Related articles Why is the picture / sound suddenly gone during the online seminar? Why haven't I received a confirmation of my registration for the online seminar? Why haven't I received an invitation even though I want to take part in online seminars? Why can't I log into the online seminar?