1. I have removed Ubuntu Kylin 14.4 from my WIN10 dual boot system.
2. I want to replace Ubuntu Kylin with Fedora Workstation 23.
3. I can get WIN10 to boot. When I enter 'exit' in Grub beta2.
4. Grub (I suspect) is preventing the use of the computer's ODD.
5. Thus, preventing the use of DVDs(Installation Disk, Repair Disk
or DiskPart Disk).
6. Can and/or how can I remove Grub from the computer to reinstall
Fedora 23?
Thanks, in advance for the assistance or help.

The choice of boot device is made in BIOS/UEFI. Whatever boot loader is found on the boot device will be loaded. In your case hard drive is booted and since it has GRUB on it that's what is loaded.

It would have been simpler to simply boot your Fedora installation medium and install it to the same partition(s) on which you had Ubuntu.
The Grub bootloader isn't preventing access to the BIOS, so something else is going on.

Thanks, yancek. The fedora reload was an after-thought, but, without the optical disk drive not excepting any disks, this prevents me from repairing MBR, initiating any install dvd, or using Linux repair modules. When system is rebooted, even with the ODD listed first in the bios, Grub is the 1st thing that comes up, not reading from the ODD. So, I need to get the odd reading 1st to install Fedora in the partition that Ubuntu was in. Any specific commands in limited bash that could accomplish that?

dose hitting the F2 button during the very early boot ( tap it every 0.5 sec. for 15 to 30 sec.) should bring up the settings

the optical disk drive SHOULD!!! be the very first booting medium
then the first primary hard drive , then a second drive

The media in ODD must be bootable, otherwise boot process will default to something else.

Is your windows 10 installed EFI? Try disabling or turning off anything related to hibernation/fast boot, make sure you have a 64-bit Fedora although I think it's possible but not easy with 32bit and when you go to boot make sure you boot EFI, if in fact you are using EFI. I don't use Fedora but it should have an option to boot EFI.

Thanks, people. To reply to your statements: Yes, all the media put in the ODD was bootable. My machine is x64, and was primariy a WIN 10 machine. The Grub program is the 1st thing that comes up and by entering 'exit' it goes directly to windows boot up, but the ODD never powers-up upon booting. So, I know its not accessing the drive. MS tech ask me to try msconfig and click on 'boot' tab. It only has one entry for windows 10, grub is not anywhere.

I will try the F2 scenario and see what I get.

Upon trying F2, all it does is takes me into Bios change, and I have been-there-done-that. Putting the ODD 1st in the list does nothing to improve the situation.

The optical drive may be faulty, how about putting your install ISO to a USB stick as a workaround.

Emerson, I tried the USB device to boot from and it bypassed and went to the Grub2 2.2 beta 2-9 screen for selection. So, I think if I could remove grub and get back to booting windows; maybe odd & usb drive will start working again. I then could install Fedora 23. repair discs & installation discs will not work currently. So, unless I format the hdd, I'm stuck.

So is it UEFI boot or not?

Why not format the ubuntu's partition then install fedora from scratch?

Grub code is and always has been only on a hard drive with some code either in the MBR and on the Linux partition or in the EFI partition and on the Linux partition. So Grub can't interfere with your BIOS.

You still haven't answered whether windows 10 is EFI. If it was pre-installed then it almost certainly is. If you installed it, then you would know which you used. If you are using GPT partitioning, then windows will need to be EFI. You could try downloading the bootinfoscript on a Linux Live CD and running it and posting the output here. Right now, we are just guessing.