CF Card disables camera?

Hey guys, I had a shoot today with two Sandisk 32gb Extreme Pro cards and am having a bit of a crisis with one of them. The 2nd card used today only has around 150 shots on it and has worked fine in every sense. The 1st card was taken out of the camera around 1pm today. It wouldn't be recognized in Lightroom or in my OSX finder window.

I took it out and placed it back in the camera to transfer from the camera body and the remaining shots area was blank on the top LCD. At that point nothing on the camera worked, the AF system wouldn't work, nothing could be brought up on the LCD screen, etc. etc. I turned the camera off then back on. But nothing turned on. No LCD, no power. Took out the battery and the CF card, replaced both, then powered back up, everything fine. Put the CF card back in card reader, rinse repeat. Everything happens the same for a 2nd time.

Is this a known problem with CF cards? Has anyone heard of any of these problems before?

Check the card, reader and camera for bent/broken-off pins. It's possible (but not all that likely with SanDisk cards and good readers/camera card bays) that a pin may have broken off inside the card and shorted data signals internally. Cheap card readers, OTOH, are a serious risk, as are cheap cards with sloppy tolerances, which make misalignment easy.