I’m here to help. I understand that you're experiencing a blank screen in Razer Synapse 4. To help us isolate the issue, could you let us know when the problem started and whether there were any recent changes made to your PC, such as a Windows update or a Synapse update? Please ensure that you are using the latest version of Razer Synapse. You can follow the steps here. Outdated software can lead to various issues, including a blank screen. Also, perform the follow the troubleshooting in this article. If you need further help, feel free to PM me so I can provide other workarounds. All the best!