PC doesn’t recognize third hard drive?

Hello everyone,

I have the following issue. I have a SATA SSD and an HDD installed in my PC. Both are recognized and have no errors. Now I bought and installed an M.2 970 EVO. When I go into the BIOS, my HDD is no longer recognized, only the two SSDs. If I remove the new SSD and turn on the PC, my HDD is recognized again. This means I can't use three drives at once (i.e., only the two SSDs or one SSD and one HDD). Does anyone have any idea how to fix this?

AHCI mode is enabled.

PC:

Ryzen 9 5950x

8GB Powercolor RX 5700XT Red Dragon DDR6

B450 Tomahawk Max

32GB Crucial Ballistix Sport LT V2 Dual Rank gray DDR4-3200

1000GB Crucial MX500 2.5"

ST2000DM008 HDD

500 watts be quiet! Pure Power 11 Non-Modular 80+ Gold

Windows 10 Pro