Hey guys, I have a VESA mount on my 27" iMac. When I installed it, I had to use the white plastic card to make the piece of metal with the screws pop out and lock in place. I have the VESA mount unscrewed and the original stand screwed back on, but the little bolt block thing is still locked in place sticking out of the computer. Anyone know how to unlock it so it will slide back into the machine? Thanks!