Toshiba satellite 14.4 psu5ru-00q003 ユーザーズマニュアル

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To recover the original factory image using the utilities on your 
computer’s internal storage drive:

Make sure the computer is turned off.

While powering on your computer, press the 

F12

 key when the 

initial TOSHIBA screen displays.

The Boot menu appears.

Using the arrow keys to scroll down, select the HDD Recovery 
option, and then press the 

ENTER

 key.

If your system offers a choice of Windows

®

 7 32-bit or 64-bit 

operating system, select one at this time. If not, skip to step 5. 

A warning screen appears, stating that when the recovery is 
executed all data will be deleted and rewritten. Click Yes to 
continue.