Helping a friend on his Acer Aspire V5 laptop that was running an OEM Windows 8 to upgrade to 8.1.
After selecting the Upgrade to Windows 8.1 via the store, the system went through it's install procedure, however after it does an auto reboot, it gives you a blank screen with the message No Operating System found, in the upper left corner.
But, you can turn the machine off and back on, and...
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