To Troubleshoot no boot situation, follow the below steps:
Step 1:
I would suggest you to download an ISO image of Windows 10 and try to install again using the Media Creation tool.
http://www.microsoft.com/en-us/software-download/windows10
Installation Media tool:
http://windows.microsoft.com/en-us/windows-10/media-creation-tool-install
Once the bootable media is created, follow next step:
Step 2: Perform Start up Repair.
Follow the steps mentioned below to perform Start up Repair:
a. Insert the installation DVD or USB and boot Windows 10 from it.
b. Select “Troubleshooting” from the first Window and then select “Advance Options”.
c. Then select “Automatic Repair” from “Advanced options” window.
This will help you to boot into your Operating system again.
Step 3: If automatic repair doesn’t help to repair the startup files, you may try to repair them using these commands through Command Prompt under Advance Options.
Refer to the steps:
a)After you boot the computer using Windows 8.1 DVD or System Repair Disc, a black screen appears with gray text "Press any key to boot from CD or DVD". Press any key.
b) Select the correct time and Keyboard type.
c) Click Repair your computer in the lower left corner.
d) Select Troubleshoot from Choose an option screen.
e) Click advanced options in Troubleshoot screen.
f) Click on command Prompt.
g) Type these following commands and hit enter after each line of command:
Bootrec /fixmbr
Bootrec /fixboot
Bootrec /scanos
Bootrec /rebuildbcd
Hope this helps.
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Peter Barnett
VP of Product Strategy
[don't post your company url]