It seems to me, that it lays on the plastic edges of the case and doesn't "touch" anything else
Check the shielding above the motherboard connector... when you push the card in, that shielding is above the card (between it and the keyboard) just above the card's connector. You can't see it at that point.
Sometimes it just barely touches, grounding out the card when you touch the keyboard.
It's hard to see but worth checking.
Had this problem nearly every time I installed an Apollo 1230.
My microbotics doesn't have as much exposed area to make contact.
Placing a strip of tape over the wires where they exit the black connector on the board is an quick way to test if this is the problem.
