Unable to boot from Windows drive after removing different drive

S

ScorpyBrainChip

Motherboard: Gigabyte Z390 AORUS ULTRA
CPU: Intel Core i7-9700K
OS: Win 10 64
Video: ASUS GeForce GTX 1080 8GB Turbo Graphic Card TURBO-GTX1080-8G
SSD: Samsung 970 EVO SSD 2TB - M.2 NVMe (x2)

Having a bit of a head-scratcher here... I have two M.2 NMVe 2TB hard drives in my Gigabyte motherboard, and no SATA drives connected. Recently the drive with Windows 10 failed, and I found it had bad sectors. I re-installed Windows on the other drive, and removed the old drive from the list of boot drives in msconfig, and everything works fine, and I was able to retrieve the most critical files from the failed drive.


However, I need to send the bad drive to Samsung to have it replaced, and when I remove the drive from the PC, and start the computer, no boot drive is detected. When I open up the BIOS boot manager, it shows an empty line and my drive. Selecting either just brings me back to the same screen. If the other drive is connected, I see both drives and Windows Boot Manager. I don't understand why the Boot Manager is detected when my inactive drive is connected, but not after I remove it.

Any help would be appreciated.

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