Nikon-Reformat card message all the time?

I have a Nikon digital slr and it is always telling me to reformat the card. I reformat it and take pictures but I have to make sure that I save the pictures before turning the camera back on, otherwise it tells me to reformat the card and I lose the pictures. I have tried buying a new card, same problem.

Either there's a snag that you are not catching in the instructions or your camera needs attention.

Nikon 1-800-645-6689 www.nikonusa.com

If it is doing this with multiple cards, then the card reader in the camera is the most likely problem.

That means it needs to go back to Nikon for service, as there's nothing you can do yourself to repair such an item.