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By default the AE/AF Lock only holds while you hold down the AE/AF Lock button on the back of the camera. If you've changed the configuration so that this button locks the AE/AF, you can unlock it either by pressing the button again or by turning the camera off and on again.
It means its set for Auto Exposure. Unless you're going for fancy effects like a faded look or a washed out over exposed look, its generally best to leave it on auto instead of lowering or raising the exposure value (EV).
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It sounds like your firmware has become corrupted.
Visit the Canon Support Site and download the latest firmware (make sure your batteries are fully charged before replacing firmware - if the batteries go flat during the firmware over-write operation your camera will be trashed).
Hi all - I know its been some time for this thread, but it helped me! When I pressed the shutter release I would hear a high pitch winding - thought it was the shutter and almost took it in for repair. Saw solution #5 - turned the AF switch on the lens to manual and back to auto - took care of the problem completely.