Solved Added new hard drive, not booting

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Willkabob

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Hi, I just added a new hard drive to my PC, and now it's saying it doesn't have a "proper boot device" even though I didn't remove my SSD which has the OS (Windows 10 64 bit) on it. I have tried unplugging and plugging their cables back in, and I have checked the boot order. I don't know what could possibly be wrong.

Update: It only boots properly if I have my old HDD plugged in, which is weird because it's wiped of any content.
 
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crjdriver

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When windows is installed, setup installs most of the windows files wherever you choose however the boot files are installed on the root of the first hard drive ie the drive connected to the first sata port.
Update: It only boots properly if I have my old HDD plugged in, which is weird because it's wiped of any content
How exactly did you wipe the drive ie did you use something like DBAN or did you simply delete data and or format the drive?

In any case, you need to repair the boot files.
https://pureinfotech.com/repair-master-boot-record-mbr-windows-10/

Note if windows was installed in gpt mode, the above will most likely not work since you need to create partitions on the drive for the boot files. If windows was installed in mbr mode, then it should work.
 

crjdriver

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BTW this is why you should have ONLY the system drive connected when you install windows. This forces setup to install ALL files to the system drive. Prior to installing windows, it is always a good idea to pull the pw connectors from all other hard drives. Once you are finished with the install, simply shutdown and reconnect the drives.
This is also a problem when you install windows on a M.2 drive. Setup will always put the boot files on a drive connected to a sata port and not on a drive connected to a M.2 connector. With only the M.2 drive connected, setup is forced to put the boot files on the M.2.
 

Willkabob

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Well, I got through it by installing a clean copy of windows from a flash drive after spending 4 hours trying to fix the issue.
 

crjdriver

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Well at least it is working and hopefully you installed with just the system drive connected so you do not have this problem in the future.
 
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