Occasionally, on a startup or restart, the screen goes black and is unresponsive after the login screen, where the Start screen is normally displayed. This usually happens after a software update (by any application), but will sometimes happen on a routine startup (no changes.) The only remedy is to perform a system restore from a previous session (before session where problem occurs). I've hoped this would be fixed via automatic updates, but it hasn't been. Usually any (same) update will install later without triggering the problem. Just now this problem occurred with a Lightroom update, which has damaged my Lightroom catalog upon restore! All auto-released updates are installed, including graphis driver updates.
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