Before you assume the worst, the first thing you should do is turn your monitor and computer off and back on again. Depending on the kind of monitor you're using, you might actually need to install additional drivers before you can use it. If you're not sure, you can either check the instruction manual that comes with your monitor or the manufacturer's official website. Alternatively, it's possible that your GPU drivers are outdated, which you can solve by downloading updates from their website. However, there are times that you might want to roll back your drivers as well, especially if your DisplayPort errors began after an update.