When the win10 system starts up, "An operating system wasn't found." Yes, the computer cannot boot to the system disk. The solution is as follows:
1. Insert the boot USB disk , set the startup U disk as a quick startup item (usually a USB storage device). For win XP and win 7, you can choose 2003 PE. For win 8 and above, it is recommended to choose win 8 PE.
#2. After entering the PE operation interface, run DiskGenius and right-click on the icon.
3. Select "Rebuild Boot Record (MBR) (M)" and click OK after success prompts and close DiskGenius.
4. Open Windows on the PE desktop to start boot repair. When the interface appears, generally select C to repair.
#5. After the repair is successful, a report will be automatically created and the dialog box will be closed directly.
#6. Shut down and restart. After the screen goes black, unplug the boot USB flash drive to enter the system.
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