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5、Can not find the system disk when the machine is turned on

Solution: 

A. Press the DEL key to enter the BOOT item of COMS to confirm whether the hard disk is in the first boot option. If it is not changed to the first boot by moving the up and down direction keys on the keyboard, press F10 to save and exit, and then confirm whether it is normal.
             
B. Re-install the system.