Unable to boot new Fedora linux or Windows with new installation: What can I do now?

Unable to boot new Fedora linux or Windows with new installation, after Fedora 27 was installed:

I have 2 one Terabyte each hard drives in my system:
Hard Drive 1:     /dev/sda1  has Windows 7 on it
                          /dev/sda3 has Fedora 27 installed

Hard Drive 2:    /dev/sdb1   is a 2TB NTFS Storage partition with no operating system on it.

See photos of partitions showing  from GParted partition manager:
sda device (Hard Drive 1)sdb device (Hard Drive 2)
I was trying to fix the problem with 'Boot Repair Disk' from
http://www.majorgeeks.com/files/details/boot_repair_disk_64_bit.html

This is what it is telling me, and I don't know what this means:
Enable Grub Repository Message
Would I need to do it from Fedora 27 running from a boot DVD?

How would I do it from the command line there?

What else can I do to make my system bootable?

Thanks for your help.
AttilaBAsked:
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Joy DingenenICT system consultantCommented:
Hey,

grub2 is the bootloader. Thats why the boot-repair-disk is trying to download that.
You should boot rescue mode from your live-cd, chroot the fedora on / (in centos the fs is under /mnt/sysimage),
Once you have chroot'ed you can go ahead and run
grub2-install /dev/sda

Open in new window

This should make it so that you can at least boot the fedora. After that i would just google what line you should add to /etc/default/grub to boot the windows.

Good luck,
Joy
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AttilaBAuthor Commented:
Thank you for your comment. I am sorry I did not have time to try this. I will try it tomorrow and get back to you.
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AttilaBAuthor Commented:
Well, I ended up figuring out the problem myself:

The first disk with the installed operating systems (Windows and Fedora 27) was fine, by itself, even bootable fine with Grub. But with the other disk plugged in which had some remnants of Grub in its boot sector made the whole system unbootable. I had to unplug it from the system to be able to boot either to Fedora Linux or Windows 7. After removing the second drive:

1. Created a backup of the second drive using a SATA to USB cable.

2. Deleted the NTFS file system from the second drive.

3. Installed Windows 7 which cleaned up the boot sector, on this drive, by itself plugged in.

4. Deleted the NTFS partition containing Windows OS created by the Windows 7 installer.

5. Created a new blank NTFS partition from the whole drive.

6. After installing both drives together in the system, the system was bootable to either Fedora Linux or Windows 7 from the first drive, and the other drive could be mounted as another volume.
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AttilaBAuthor Commented:
This was the solution that worked.
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