All, The reboot issue with the new install on the HP ProOne 600 (i5-8500) is a bug: [drm:intel_dp_detect [i915]] *ERROR* LSPCON init failed on port D https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/4458 Looks like we are just stuck until it is fixed. At least now we know the cause (most likely). This was fixed in 5.14.7 and now is back. So we will see when a fix comes through. A least I know I'm not crazy -- yet... -- David C. Rankin, J.D.,P.E.