
Originally Posted by
GrumpyDiver
Mike: If you think of your camera as a computer you take pictures with, rather than just a fancy electronic SLR, what I suggested you do makes a bit more sense. Whenever your home computer locks up, you fix things by powering it down and then starting it up again. What this process does is forces the operating system to load itself. Laptops are a bit more of a pain, because all the power supply does is charge the battery, so when one of these locks up, you have to physically remove the battery.
Effectively, this is what you did with your camera. The problem with your camera / computer, as you had already found out, is that it is designed to not totally shut down when you turn it off. Otherwise, it would have to reload the software every time we turned it off and would drive us photographers crazy with the startup delay. The engineers designing the camera know this and keep certain parts of the camera running, even when the camera has been turned off.
They do a couple of other things too. We want the camera to remain “hot” when we change batteries, so what is often done is to have a capacitor keep the camera running while we change the main battery. Generally there is also a secondary battery to keep any presets, for instance, the system time and our custom settings active.
The problem with any third party part is that the camera manufacturer has no way of knowing if the component is compliant with the software in the camera, which is why I tend to stay away from them. In theory, if they have worked with the camera manufacturer and have a licence agreement with them, there is a good chance that the parts are compliant with how the camera is designed to work. Somehow, I rather doubt that the Chinese knockoff manufacturers have done any more than reverse-engineered the original OEM part, and how well the reverse engineering was done.
Based on your description, and the fact that you had already tried removing and reinserting the battery, it was fairly obvious that your camera had either locked up because some condition that the software design engineers had not planned for and the camera had gotten itself into a state that the normal routines for preventing lockup got bypassed. The other explanation is that you had actually suffered hardware failure in one of the camera components.
Anyhow, buy shutting down the camera, without a battery and turned on drained any capacitors or backup batteries and the camera was forced to do a cold reboot and totally reload the operating system. The problem with that strategy is that we don’t know how long it will take to drain the backup power. One to three days is not a unreasonable length of time for this to happen. I have an older pro video camera where the backup battery lasts for months, but fortunately it is located so that it can be removed, forcing a hard reset.