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11 Mar 2012  
DavidE

Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64
 
 

As soon as you turn on the PC keep tapping the F8 key (don't wait until you see the Dell logo screen).

You can also try repeatedly tapping the F2 key to enter setup as soon as you turn on the PC.
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