I'm having trouble connecting my new SP3 to my 4K TV. I have a Mini Display Port cable and when I connect it to my Sony 4K TV, it does show the available resolutions (with the 4k option). However when I select it, the screen goes black so I quickly revert back. My refresh rate is set automatically to 30hz, so am confused. If it's the cable I will buy a new one, but how can I confirm this? Will the official MS cable support the 4k output?