mac osx

I start up my iMac today and it took forever to boot. When it does the finder isn't responding. Any click will trigger the wheel and the system freeze. Activity Monitor, Console and any application I attempt to run freeze. Parallels isn't even running.

When I try to install OS X 10.14 Mojave Beta in Parallels as a Guest OS, it stops with the message: "Installing macOS Mojave on this Mac requires that all graphics cards have Metal support and that FileVault is disabled." This happens both via upgrading High Sierra and with a new install...