Your Canon 6d SLR won't turn on. I had this problem myself and went through google searches and didn't find the answer. I found the solution and share it in

It does not appear until you switch the camera to Live View mode. Let's leave remote shooting out of the equation for the moment. The camera itself can fire a Canon Speedlite in Live View mode. It does not seem to matter if Exp.Sim. Is set or not. It does not seem to matter which "Silent LV Shooting" mode setting is selected, either.

If your camera will not power on, please attempt to charge your battery, or use a battery known to be fully charged. If your camera will still not power on, your camera will need to be serviced at a Canon Factory Service Center. Canon has excellent service options and we are eager to provide any assistance you may need.
Hi community, I purchased a new Canon 6d mark 2 last year August It has never come on for once and each time I ship to Canon service center for repairs, it comes back with the same problem. This camera has literally never taken a single image since purchase and Canon would not do a refund/replac . 7 228 406 440 148 156 459 74

canon 6d mark ii won t turn on