Windows 8.1 upgrade reboots to black screen of 'nothingness'.

If you’ve just upgraded your Windows 8 (non RT) device to Windows 8.1 and suddenly upon reboot you’re facing a quietly humming computer with a black screen of nothingness….don’t panic.  You’ve probably just got Master Boot Record issues.  This can be a fairly easy fix, particularly if you’ve already created a Windows 8.1 Recovery disk. …

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