Probably, the "Ground" and the "Tip" are in contact somewhere.
For Canon's this cause a continuous contact to the Shutter and then all normal operations of your camera are blocked.
See the next diagram:
Merlin + Papywizard on Windows 7 & Nokia 770 Â§ N810 & Acer (Netbook) + PanoramaApp AndroÃ¯d + Deltawave PapyMerlin BT + Autopano
Spherical Pano (180 x 360) with Canon 40D + Canon EF-S 10-22mm f/3.5-4.5 Zoom & PÃ´le Pano with Canon 5D MK2 and shaved Tokina 10-17 3.5-4.5 AF DX Fisheye
Gigapixel photography with Nikon D200 + Sigma 70-200 F 2.8 EX DG APO HSM