Hello, I bought an industrial 42" PC screen recently and a new computer as well. Unfortunately when I turn on the computer it only displays as a 15" screen rather than 42" as it should I have a HDMI cable plugged in and bought a graphics card but neither have solved the problem. The screen is made by Winmate and was purchased off ebay. The seller assured me that it worked "fine" for him and showed a full screen and was very unhelpful. I can provide screenshots once I get home. Thank you so much in advance.