help! DaVinci not working

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Help, I don't know what to do anymore. I switched monitors and suddenly DaVinci no longer reads clips. I see the projects, I see the timeline but it does not play, I do not hear the audio, it does not accept any timeline commands. I reset the video card (Radeon 4K 4G ram) I installed the latest version driver from AMD. I reinstalled Davinci 17.2.2, but nothing happens. I am attaching a screenshot for you to see. I do not know what to do. Can anyone help me? Until yesterday everything worked perfectly. Thanks in advance...