Verify and make sure the mountlist is 100% correct.
Try "version your.device" and see if it returns version info or fails to find the device.
If it fails the card is most likely faulty. If it does return info it might still be faulty, check for damages on the card and dubble check orientations on removable cables.
Mind you if you use the card internaly in the A1200 without any extra power to the motherboard that (not enough power to the device) might also be the cause of failure.