No Windows Boot Manager on dual boot system (7 & 10)

Not to revive an old thread, but it sounds similar enough to my situation that someone can probably direct me easily from here. I have an old PC that my son wants to take the HDD out for his new build. It has Windows 7 on it. I installed a new HDD into the old system that I want to get working. I set up the new drive while using the old OS. Once formatted, I installed Windows 10 on it. I assumed I could then remove the old HDD and it would just boot to the new HDD. However, it doesn't seem to boot from it. In the bios, there is no boot manager which I do see with the other drive in. So can I use the EasyBCD program to set up something on the new drive OS so it will actually boot from it? As is, without the old drive in, I just get a screen that says "Enter bootable device and press any key" or something like that.

I tried just plugging in the new drive as it arrived in the box new and it wasn't even recognized. It just went to the screen to connect a bootable drive and hit any key.

So as it is, do I need to use the disk management screen to somehow get it back to unallocated?

frostbyte3964 said:

I tried just plugging in the new drive as it arrived in the box new and it wasn't even recognized. It just went to the screen to connect a bootable drive and hit any key.

So as it is, do I need to use the disk management screen to somehow get it back to unallocated?

You need to boot the computer from a Windows 10 installation USB flash drive or DVD, then install Windows 10 to the new drive. New hard drives are not bootable out of the box, you need to install an operating system onto them.

So, to make it easier for dualbooting install Windows 7 and Windows 10 (dont have to use just those) and make sure they are both on GPT or MBR, if you need to reset the option for these do MBR or GPT in legecy boot in your BIOS. If the bios does not support one of those, stick to the one that it does support!


Hope this helps!

-Void