If ever you're black screening, sometimes just restarting the client fixes it. In this case, with the constant black screens, I would recommend either deleting and redownloading your cache or updating your java. Preferably both. 😀
I've been playing RS3 since 2015 but played Runescape casually a few years before that. I'm not the best when it comes to high-tier PVM, but I suppose that would give a chance to see who are the more helpful members of our community. Would love the chance to make this server the best it can be.