Sorry for the late response, pcrepair, and many thanks for the information above that you sent me. I tried a number of your suggestions. The xw4600 is an old workstation and HP only offer drivers up to Win 7, which I doubted would work with the later OS. What eventually worked for me was to...
My old xw4600 has been running Windows 11 for many months but yesterday the screen went blank. I suspected the video card and swapped it for a spare which cured the screen problem, but it appears in the process Win 11 had crashed. I went for Recovery (keeping files) but in the process noted all...