Win7 system can not enter F8 and no mode how to solve

  
Win7 system can not enter F8 and no mode how to do it? This problem, if you do not have important things in the computer, personal advice or reinstall the system, let's talk about how to reload it!
If you There is a U disk, or a system disk, if it is a U disk, it must be set on the bios motherboard, set to U disk boot.
Command prompt tool under WinPE system; then enter the following DOS command at the position where the cursor is located (press the Enter key for each DOS command):
4, the order is:
Cd c:windowssystem32
bcdedit /set {default} osdevice boot
bcdedit /set {default} device boot
bcdedit /set {default} detecthal 1

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