I run WIN7 with 16GB RAM and an Intel i7 chip. I have an LG 40" 4k screen/TV mated to an Asus R7 370 Series (Strix) 4GB graphics card. Most of the time the screen is steady but when working with programes with fine lines of text (Excel, Filezilla etc.) parts of these lines can, and often do, flicker. Very occasionally this flicker appears on the desktop and other places. Also, on a regular basis, long windows (Explorer etc.) that you scroll down will jump back to the beginning. All drivers are up-to-date and I have experimented with various settings on the graphics card (which can be over-clocked but isn't). I have replaced the cable for what is probably the most expensive on the market! This is driving me nuts! Suggestions/solutions gratefully received.