UPDATE: Microsoft has now supplied an update to solve this issue. The update is available here: http://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB4043292
Microsoft is warning customers that some OEM PCs may take up to 5-10 minutes longer to boot than is intended after installing a Windows Store application update.
According to KB4043345…
After installing a Windows Store application update, some users may experience a black screen on their device for 5-10 minutes upon rebooting the OS. Some OEM factory images create incorrect registry keys during image creation. These registry keys conflict with the app readiness service. After 5-10 minutes of black screen the user will regain use of their device. This issue is triggered on every reboot.
Microsoft is working on a solution for a future update, but has provided a workaround in the KB article that requires the deletion of the registry key values.
The PC will eventually boot, but the bigger problem is due to the lag in boot time and the blank/black screen, customers believe an update broke the system completely.
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