I have a D3400 that will not power up. I have fully charged all 3 batteries that I have and verified proper voltage with a voltmeter. I have tried all 3 of the batteries in the camera. When switch the camera on nothing happens.
In the distant past I have had a couple of instances where this happened, and if I let the camera sit for a day or two it started working again. But now it won't come on at all. I have let it sit for several weeks and recharged the batteries and tried again, but no change.