The cards that work, with a manufacture date of 3/2014, have G69016-001 on the bar code sticker.
The cards that do not work, with a manufacture date of 8/2014, have G69016-002 on the bar code sticker.
Concerning the BIOS...we explored BIOS settings earlier on, but don't feel that is the issue because:
The problem is not that Computer A works and Computer B doesn't.
The problem is that Computer A works with the 3/2014 card, but does not work with the 8/2014 card.
In this situation, it is the same BIOS revision, same computer, same slot, etc.
I have also tried the following:
Trying the card in each available slot (3/2014 works in every slot, computer fails to boot with 8/2014 in every slot)
Tried booting with both a 3/2014 card and a 8/2014 card installed at the same time (computer fails to boot)
Tried installing the 3/2014 card, logging in, installing drivers, then installing the 8/2014 card in the slot the 3/2014 card was in (comptuer fails to boot once the 8/2014 card is installed)
I have now tried them in a Dell Precision R5400 as well, but with the same results as above. Any time a 8/2014 card is installed, it fails to get to the Dell splash screen. I just get a black screen with a blinking cursor in the top left corner and cannot enter BIOS.
I have not tried disabling the on-board adapter. I will try this soon.