Hi - My nice new R5 has a fault - a dead Mode button I have tried two or three suggestions to cure this, but it remains a problem - It is currently stuck on M and I want to load the latest firmware 1.5 (1.4 installed) - I need to select P to do this, someone suggested that it would load with M selected - sadly not for me! - also tried with the "FIR" ended version of the software. Shutter button not working - my new canon 5d mark iv will focus just fine when I press lightly or hard on the shutter button but for some reason just won’t take a picture. I’ve previously used a 2000d just fine. I’m using the 70-200 2.8 lens. Any help or should I get it checked out? EOS M100 AF Assist light not working in EOS DSLR & Mirrorless Cameras 01-04-2024; Canon PowerShot SX510 HS screen not working in Point & Shoot Digital Cameras 01-03-2024; Sigma 70-300mm f4-5.6 dg macro for canon blurred images in EF & RF Lenses 01-03-2024; Speedlite 600EX-RT Won't Work in Speedlite Flashes 01-02-2024 Options. 10-31-2021 06:08 AM - edited ‎10-31-2021 06:12 AM. Remove everything from the camera. Insert battery and try to power it up. Check micro switches at battery door and at memory card slot. There is a firmware bug that may kill 1000D if you have 1.0.5 or older. Remove the battery pack and wait for one minute. Power on your device. Check if it resolves the issue. Note: Some devices have a Priority setup option in the menu. If your device has this option and it's set to Release, you can force the shutter button to take a picture without autofocusing. However, if you change scene modes on the mode dial Unfortunately by dropping the camera you may have knocked a connection loose inside the body. You would have to take it apart to inspect that area where those controls are to start and if you are lucky you will find and fix the connection. Try a new SD card, 32GB or smaller, full size not microSD with an adapter. Be sure to "Low Level Format" it in the camera. Canon 5D Mark IV - Main Dial not working to adjust aperture and other setting. Itsmedavidv. Apprentice. Options. 10-17-2020 01:46 AM. 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. aVzs.