I'm new to the forum. Yesterday, the auto focus on my 40D stopped working. When the AF switch on my lens is on it won't take a picture. It also won't focus or allow you to select a focus point. Also when in AF all my controls are disabled, can't adjust shutter speed, f-stop, etc... The scroll wheels don't work. I get different results in different creative zones. Some will not let me shoot in AF or MF, others only allow my to shoot in MF. But none work in AF.
If I switch it to MF on my lens everything seems to be fine and I can shoot. I switch from AF to MF pretty often using the switch on my lens. Tried a different lens and I'm still having the problem.
I also noticed before this happened my camera has been having a difficult time focusing in AF mode.
I was out shooting yesterday in the city where it was very cold. I didn't have my camera out for extended periods of time though. I only pulled it out from time to time. Not sure if that could have something to do with it.
Has anyone had similar problems? I really hope it's not broken, I shoot daily and have been loving my 40D until this happened. Any help would be greatly appreciated. Thanks in advance!