It seems your boot image has been corrupted. Pleas try following methods.
1. Go to BIOS settings by pressing F2 during boot. Insert portable OS flash drive in to USB slot. Then select boot from external storage. This will run your portable OS and take back up of your important data to other hard drive. Then reinstall OS image.
2. If you are using windows OS, go to startup system repair option during boot. That will restore your system.
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