Drive with Windows 10 installed will not boot

[Bond679]

I currently have two drives in a computer, one, the legacy drive has Windows 7 installed. The other newer drive has windows 10 that I bought online installed. When I installed the new drive and installed Win 10 on the drive, on my next boot up, windows smartly recognized both operating systems and gave me a 'dual boot' startup screen where I may choose which operating system to run. This was without any Bios or other changes whatsoever.

Now, wishing to remove the older drive and have this computer boot to the Windows 10 drive only, I find that when I remove the Win7 drive, the computer will not recognize the new drive as a boot device stating ' Reboot and select proper boot device or Insert boot media in selected boot device'. The computer will only boot if I have the old Win7 drive plugged in and set as the primary boot device in the Bios.

In the Bios, I have tried manipulating each of the provided settings including the 'boot device priority' and 'Hard Disk drives'. Regardless of each of these settings the newer drive will not recognize as a boot device.

My intent is to remove the Win7 drive completely and insert into a newer computer having it be 'dual booting' like like the old, leaving the older computer with Windows 10 only.

The motherboard is a Asus P7-P55DE.

Thanks

 

[drtweak]

This is because the Boot info is store on the windows 7 drive.

Remove the windows 7 drive and then boot off windows 10 media

Then follow the instructions here

http://pureinfotech.com/repair-master-boot-record-mbr-windows-10/

that will get your windows 10 back up and running

 

[Bond679]

Tweak that was exactly the problem. I unhooked the old drive, inserted and booted with the Win 10 recovery disk provided wit my new computer, followed the instructions in the link and when I hit the 'repair' option, it took all of three seconds before the system rebooted itself and worked correctly.

Thank you very much.