Hi,
Thanks for posting on our forum!
Based on your description, I think your issue is caused by not formatting your new disk. A hardware disk which stores your operation system should be formatted, so as to be assigned a drive letter, like our C:\ drive. If a drive does not have a disk, then when your computer boot it cannot get access to your system drive. This inaccessible disk leads to the failure of booting your computer. So, I suggest you to use the old drive first (make sure that the old drive still has your operation system file.), then boot your computer, to see if you could enter into your computer this time. When you log into your computer, then you can plug in your new drive, then you go to disk management to format your new drive.
Thanks for your support! Hope to hear your good news soon!
BR,
Joan
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