Hi i have a nikon D3100 that does not work, it says "Err" in the veiw finder, and does not light upp the back lcd, and when i connect it to the computer it does not reqognise it. and the same whit the memorycard, i have downloded the service program and it can not connect whit that either (it works with my D5000) , can it be the motherboard that is broken? or something else?
Best regards Byman