im not sure about 1000D cos im using a Nikon. On my camera however, i need to set to auto mode on both lens as well as within the menus.
the automatic setting on the mode dial shud not affect your autofocus ability
I think what you are trying to shoot is something shorter than your lens minimal focusing distance. Hence it is unable to achieve focus and therefore the blinking confirmation light. Try moving back abit.
I think what you are trying to shoot is something shorter than your lens minimal focusing distance. Hence it is unable to achieve focus and therefore the blinking confirmation light. Try moving back abit.