Lenovo B50 OS windows7 need USB to boot every time

Oct 20, 2022
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am facing a strange problem. I installed Windows 7 on my laptop (From DVD) after installation system did not boot just Lenovo and the black screen again and again.

I re-installed Windows from a bootable USB. Now I have to use my USB to boot every time. Without USB System the boot failed.
How my system automatically boot from my harddrive?
I already tried diskpart, bootsect, bootrec, /fixmbr, /fixboot /rebuildbcd, etc. but no result.

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