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Occasional Contributor
Posts: 8
Registered: ‎04-17-2016

Re: Canon 5D Mark 111

Hi guys, thanks for your assistance re my 5D Mark iii.  Unfortunately it was the PCB board the was not working.  Sent it off for repairs. It's now back and like new.

@OOP wrote:

Thanks guys but none of the advice worked.  I have now return the camera to canon.  

i really do appreciate your assistance.


New Contributor
Posts: 4
Registered: ‎04-28-2017

Re: Canon 5D Mark 111

[ Edited ]

Once the batteries are out, toggle the power switch on & off about 10 times.Go ahead and replace the clock battery (and honestly, this is probably a good time to replace it if you haven't), and then insert a fully charged camera battery.
For some reason (I'm told) toggling the power switch on & off a bunch of times in a row helps clear capacitors in the camera and flushing on board memory. If this method won't works for you then the only thing that can work is hard reset. For hard reset details and other fixes you can use Canon 5d Manual for better results. 

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