@@samuelmartin6500 probably the internal clock battery is dead. To change it requires you to disassemble the body though unlike the D3 series. You can try charging the internal clock battery by putting a fully charged battery in the camera for about 2 days. If the problem still continue, you might need a professional person to replace the internal clock battery.
Thank you so much for your video. I had the same problem on my D3x. I was luckily enough to find this video, otherwise I'd have taken my camera to the Nikon customer service for repair.😅
Good afternoon Sir, I got a problem with the same problem. dell Inspiron 1420. my main problem is there's no display even though I tried to clean everything inside? what's the possible main cause?