Go to the Help Center using the link below, and you should find a chat icon in the bottom right corner. When you click on it, it starts a chat. Typing the word “agent” should bypass the automated responses.
Or you could tell us more about the issues you’re having, and we’d be happy to help. We’d need to know more about your system - operating system, Lightroom version, etc. The easiest way to do that is to go to Help menu > System Info. Everything going black sounds like it’s probably related to the GPU, so these troubleshooting steps may help: https://helpx.adobe.com/lightroom/desktop/kb/troubleshoot-gpu.html