Is it possible to repair Win7 disk which is now seen as uninitialized by Windows?

After hibeation, which always worked without incident, the computer would not reboot. Instead it would flash the screen, go black, and repeat. When attached to another computer, the disk was seen as "uninitialized." Recovery software could see all of the files and file structures. I used that software to catalog everything and used another program to make a sector image copy onto another 1TB drive. The question is, is there a way to rebuild the boot sector and keep all the files? In other words, can this damage be undone so that I end up with a bootable working drive?

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