"Hi...I had the same problem. It was all the CF card to blame. There is a reset procedure by which you open the battery slot, remove battery, open card slot, push out the card. Pause...Push back card and close battery, pause 2 sec, push in battery and close lid. All back to normal.
It was all due to a corrupt card...I repeated this over and over with my 8GB card and it never went bad again...The moment I put back the 4GB all symptoms reappeared.."
Hello all, This is Kiasto Filmmaker in South Africa. I think I got the problem. When I remove the 32G CF card & insert the battery without CF card the camera switches ON and says there's no card when I press Shutter button but when I put the same CF card back It doesn't switch on. I will consider getting another CF card.
First check the battery compartment door. There is a micro switch that turns the camera off when you open it. If the battery cover does not press down on the switch the camera won't go on. Make sure that the battery compartment door covers the batteries so that the micro switch senses that the cover is closed. Or you can also send your camera to repair center if it is under warranty or you implement other troubleshooting ideas from Canon 50d Manual to resolve this issue.
