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HP Z620 Latest bios won't recognise any 4th HDD/SDD/M.2

HP z620
Microsoft Windows 10 (64-bit)

Hey Guys, 


This is my first post - 

I have an HPZ620 with the latest BIOS being 3.96 as of 15 November 2019. Xeon  E5-2670 v2  

I currently have ALL SSD drives installed on this PC, 250Gb Kingston SSD (Boot drive), WD Blue 250Gb SSD as (data drive) and a game install drive Samsung NVMe M.2 500Gb on a PCIe adapter  all working excellent 

The issue I have is the Pc won't recognize any more Storage devices, HDD/SSD/M.2 drives I was under the impression maybe the SATA ports were broken so I purchased another Samsung NVMe M.2 1Tb and another adapter for the PCIe slot. 

Still no luck it will not recognize the SSD or any drives for that matter. 

I've followed numerous posts about the Samsung drives and stuff like that but the pc is currently detecting the Samsung NVMe M.2 500Gb with no issues 


I have looked in the bios under storage options etc its set to RAID + AHCI, all slots are enabled and set to the correct speed or set to Auto, 

Please any help appreciated 



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