Hi, thanks for the quick reply!
Updated some of my system specs in my profile.. Haven't tested in windows safe mode yet, will do that after submitting this reply.
I've configured the Bravia TV as first monitor. That's also where the taskbar appears. Works fine with a second monitor, but doesn't seem to work on its own..
Updated the nvidia drivers, motherboard and graphics drivers.
update: I can only go into safe mode with my VGA monitor, my HDMI doesn't get a signal before windows starts. Does this mean it's a chipset problem?