I've got a virtual machine (Hyper-V) running Server 2012R2 with SharePoint 2013. It's not the end of the world if SharePoint ends up being like exchange for me: about once a year or so I end up building a new server and migrating everything because the old one developed weird unfixable issues. This machine boots up normally but never displays any video. I get a black screen and a mouse pointer. Everything is actually running, I can connect to the SharePoint websites, connect with RDP (black screen there too), manage it remotely (everything except device manager). Advice what to try next, is it possible to fix this?