Well, it's been a long, long period. I spent hours on a chat line with a Microsoft tech. (in south Africa). He convinced me to DL a Microsoft Media tool & reinstall Windows 10 over Windows 11. It seemed like it was going to be OK. It installed Win 10 over Win11, rebooted did some updates then went blank: the display. Now nothing, Just a blank screen. When you reboot, you can hear voices in the background giving some sort of instructions, but that's it. No display, no access to bios, NO NOTHING!! . I checked the contents of the freshly installed OS & all looks well. I am at a TOTAL loss as what I can do other than ship the PC to perhaps Dell, but then what??