Chosen Solution
Canon PowerShot S 40 No power..battery good..I haven’t put a memory card in yet and I have 3batterys that are good..charger is fine checked the battery door nib and it’s good..heard it could be a fuse
Sean Bender entirely possible that this is an issue with the DC-DC part. Post some good pictures of your main board so we can see what you see. Schematics are almost non-existent for this camera so we’ll have to improvise. Adding images to an existing question Make sure that you check the switch and that the battery cover properly seats. It is a vital part of the power distribution.
