@lostandadrift To follow up the mixed up bootsessions is from far away quite invane. What changed the Ubuntu stick or the linux server diskt ro your UEFI: Did it change the bootloader to that respect, that Windows can not boot? Second possibility ist a defective GPU chip in the proc. But that looks less possible to me. Than it rather would be a complete proc breakdown, and no POST would run. So you could try two to three ways. 1. Prepare with help of the Media Creation Tool a Windows Install and Repair stick. Boot from it, choose Repair in one of the first screens, and try to repair the bootsections (Startverhalten). Sometimes it helps, although Win RE often replies, we couldn't repair -> inspite of it try a reboot. Sometimes out of the blue something has changed, and the Pc boots suddenly your Windows disk. 2. Check if on your so far unchanged Windows boot disk there is a OEM partition at the end of the disk. If you didn't change the partition scheme (which I doubt a little 😉), you could start the PC with the F11 Tab pressed. It should load a small OS with the PowerRecover program, which can install the factory image. But the folder Recover on the partition D or E:\ must be still present. If you meddled with the partitions, Power Recover will not work anymore 3. You could do a new Windows installation from scratch with the Windows USB stick, instead of calling the repair features just let it go on and install Windows anew. . Cheers, daddle Edit: I do not think it is a Bios Version problem, other wise it couldn't start and boot Ubuntu
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