Stuck on M.2 Upgrade :(

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   Hi Guys,
I did a cursory search on this issue and couldn't find a solution to a problem I am experiencing.

Here's the story:

I have an ASRock Z170 Extreme6.

All of my non-media files (Windows and games) reside on a SanDisk 256gb SSD.

I recently purchased a 970 EVO NVMe M.2 SSD on a really good sale thinking it would be an upgrade.

My idea was to clone my SanDisk SSD to this new one.

I finally got around to installing the M.2 SSD today. As you can probably guess, I ran into some issues.

After I installed the M.2 SSD into its slot, it appeared in my list of bootable drives in UEFI, HOWEVER, my SanDisk disappeared form that list.

I freaked out and eventually read on these forums that the PCIe M.2 slot shares the SATA3_0 and SATA3_1 bandwidth. I got stoked thinking I just solved all my problems. I opened up my case again and switched my old SanDisk SSD to SATA3_3.

That did nothing. The SanDisk was still not listed as a bootable drive. The system browser in the UEFI saw it, but it wasn't listed as bootable. My regular media HDD was listed as bootable just fine, though.

As soon as I removed the M.2 SSD, I was able to boot from the old SanDisk SSD in SATA3_3.

It seems like installing the M.2 SSD somehow overrides my existing SSD? I hope all of this makes sense. Any and all help would be GREATLY appreciated.

Sincerely,

Pants