My two year old Nikon D70 suddenly started acting up two weeks ago. I whipped it out to get a shot of the kids being silly and the Card reader light was blinking. The camera wouldn’t turn on or do anything I asked of it. I assumed it was a dead battery but charging didn’t fix the situation. So next I went to work on the card formatting it on my Windows XP system. That seemed to do the trick, but I went through the dance several times over the next few days. So… I bought a new card. And that seemed to do the trick but then the issue returned. A deeper Google search with proper terms “D70 card reader + blinking” = tons of hits. Seems this is a huge issue and Nikon will repair any and all cameras regardless of warranty status.
I’m posting mainly for this link which contains the Nikon PDF form for sending in your camera to repair the BGLOD Blinking Green Light of Death syndrome. Repairs average a five day turn around.
Nikon Service Advisory – Nikon D2H, D70, N55, Coolpix 3100, Coolpix 5700, Coolpix SQ