I accidently left my 550d on overnight, and now it wont boot. It works fine without a memory card, but as soon as i put one in, i get nothing but a blank screen. No flashing memory card access light, but i do get shutter/aperture and iso info in the viewfinder. It also autofocus' on half press of the shutter. Ive tried everything, ive even formatted and reinstalled all the magic lantern files, to no avail.