Is your Steam Machine giving you troubles? Do you want to know more about how it works? Valve has an excellent Feature & Troubleshooting guide that can help you address the basics.
Looking to find out if a 2K game is good to go on the Steam Machine? Check that game's store page on Steam's website or inside the Steam client. From there you'll find a Learn More button under Steam Deck Compatibility, and Steam Machine will be one of the options where you can get more info.
In case all that doesn't do the trick, Valve Support is the best resource for any issue specific to the Steam Machine. While we are happy to investigate in-game concerns, 2K Support may have to redirect you if it's a hardware-related matter.