New M.2 SSD shows up only sometimes in the boot manu

eyaln1

Reputable
Apr 8, 2015
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Hi everyone,
I recently bought the Samsung 960 PRO NVMe M.2 1TB as a replacement for my Samsung 840 EVO 2.5" 1TB. The problem is that when I boot the computer I can only sometimes see the drive in the boot manu. I've managed to clone my old drive to the 960 in one of the times that the drive was visible but I can't use it until it shows up every time I boot up the computer.
I've already tried to update the BIOS and disable CSM in order to fix the problem but its still inconsistent.
Specs:
Motherboard- Asus Rampage V Extreme
CPU- Intel i7 5960x
OS- Windows 10