hi all! today i have experience a problem with my canon eos 1. i mounted an old lens and after shooting a couple of pics, the shutter stopped working and i saw the warning "bc" blinking on the display. does anybody know what's wrong? i don't think the problem is the battery, because it's new. i fear it happend because of the old lens. but now, after trying unmounting the lens and the battery as well, the warning is still there. what shoud i do? thanks!