SAS Drives MIA

I have 3 sas 4tb drives and was using 2 on a windows pc with a LSI 9211 - no issues, until I committed to building a dedicated server.
Got unraid installed and running no problems until trying to add drives to the array and they were nowhere to be found. (Besides the 512gb ssd)

Could see the LSI card and correct driver being recognised in unraid but no drives anywhere.
For a sanity check I moved the card and one of the drives back to windows pc and sure enough it worked. I checked the sector size was 512bytes.
Moved the drive and card back to the server and the drive doesn’t appear to be spinning up.
Tried moving the card from the x16 slot to x1 slot and got a ‘PCIe bus error’ when trying to boot to unraid’

There must be something I’m missing but it defeated me today
Any help is very very much appreciated :))