Only other thing to do is, and I dont wish to try and make it sound like I am teaching granny to suck eggs, remove the lens, CF & SD cards, battery and internal battery for a few mins. Try attaching a different lens and different battery if possible. Put in a different memory and get the camera to do a full low level format. Then try taking a shot and see what happens.
It could be that the camera is remembering a fault that has cleared itself and just needs a total reboot if you wish.
If that still doesnt work then as per above I think Canon are the only ones in a position to help now.
Yep 1 spare 1D Mk III and a 5D...
Wierd that it was working this afternoon and then for no reason at all it just stopped working.
Pete found the battery was dead - the shutter-button had tripped, raising the mirror (but not opening the shutter) and had drained the battery.
Put in a new battery - nada...
We've tried all the above twice, just to see if we're being thick and missing something.
No joy.
Well, according to Canon UK - it's dead and has to go back to them - it's not a field-repair...
I hate to say it, but that's now FOUR top-end Canons I've seen die out here...
Now, have you been sneaking into other peoples tents with bars of soap in a sock, and pummeling their cameras?!?!![]()

Well, according to Canon UK - it's dead and has to go back to them - it's not a field-repair...
I hate to say it, but that's now FOUR top-end Canons I've seen die out here...
I'm pretty sure it will just be a coincidence. Enough pro-togs use them in harsh conditions on a daily basis to prove they are easily as capable as Nikon, if not more so.