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X99-UD4 BIOS update now system wont boot with raid card plugged in - HELP

 MB Bios update - now PC wont boot with areca 1260 plugged in
I flashed my Gigabyte x99-ud4 motherboard bios a couple of days ago and since then my system wont boot with the Areca 1260 plugged in. It wont display any output to monitor and is non responsive to any keystroke.

Ive tried:
Rolling back to the origonal BIOS (F6)
Upgrading to the latest BIOS (F12)
And everything in between (F6-12)
Clearing the CMOS
Tried swapping the raid card to the first PCI-e slot (in case it had issues on a x4 slot)
Removed the BBU
Im looking for another stick of RAM to test with and another system but am starting to get desperate (16tb offline until I can fix this)

Any help would be much appreciated

System
Gigabyte x99-ud4 rev1 (Current BIOS F11)
WIn 8.1pro (installed on revo 256gb pci ssd)
areca 1260 6x4tb in RAID6