Canon 5D Mark IV - Main Dial not working to adjust aperture and other setting

[Itsmedavidv]

The main dial on my Canon 5D Mark IV is not working to make adjustments while in any of the modes. I can hit the quick (Q) button and make adjustments or use it in settings other than went in in a shooting mode. Any ideas?

[Ray-uk]

Make sure you haven't got the on/off switch in the lock position.

[MikeSowsun]

Which "main dial" are you talking about? The main dial can mean different things to different people, and the fix will be different.

[Itsmedavidv]

The “main dial” near the shutter button.

Question: @Ray-uk I’m a newbie. What on/off switch are you referring to? I’m not quite sure what you mean and I’ve searched the manual for this. Thanks

[MikeSowsun]

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@Itsmedavidv wrote:
The “main dial” near the shutter button.

Question: @Ray-uk I’m a newbie. What on/off switch are you referring to? I’m not quite sure what you mean and I’ve searched the manual for this. Thanks

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He means the "Quick Control Dial" on the back which has a sliding lock switch below it. That lock switch has no effect on the main dial near the shutter button. 

[Waddizzle]

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@Itsmedavidv wrote:
The main dial on my Canon 5D Mark IV is not working to make adjustments while in any of the modes. I can hit the quick (Q) button and make adjustments or use it in settings other than went in in a shooting mode. Any ideas?

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When the viewfinder display is active, does an "L" appear whenever you try to use it?  If so, the problem is the lock switch.

[HDDENB]

Yes yes! Wow I can’t wait to check that in the morning!