Reasons for no boot condition:

1. System/OS partition formatted by mistake.
2. Damaged MBR.
3. Unable to install new OS due to Dynamic MBR as a subset of first condition.

Partition problems:

There may be some messages that the new OS can only be installed on GPT disks.

*Reason for this Windows 8 and Windows 10 use Dynamic MBR for their functioning. When these two of these OS are installed previously the hard disk format is changed to MBR. Thus it is necessary to convert when installing new OS when you don't need the old one.

www.tenforums.com

The best way to recover from this is using minitool partition manager bootable disk*.

* It doesn't involve any data loss.











1. Download the Bootable Folder.
    x86 (32Bit) x64 (64bit)
*Based on processors.
Method to create a bootable folder.

2. Unzip the folder and copy to a bootable pendrive.

3. Boot the pendrive according to your system format.
may be F2/Del/F10 to execute boot from pen drive.

4. Then this section appears -> Select boot from Mini Tool Partition Wizard (Safe mode)

http://www.partitionwizard.com/

5. Type 1 or a desired resolution and press enter.

http://www.partitionwizard.com/

6. Right Click on Basic MBR/Dynamic MBR and then convert it to GPT.

http://www.partitionwizard.com/

7. Now try to boot the new OS on the hard disk and everything will be OK.

8. For problems post in the comment.