Here are a few suggestions which most likely you have tried or checked out: 1)test your batteries with a digital meter. Batteries fresh out of the package may have a low or faulty battery. If any one battery is between 1.0 and 1.2 volt, the camera may not function properly or not at all. 2)make sure the slide lock on the SD card is not in the lock position. 3)try formatting your SD card before putting it in the camera. 4)check to see if there is a software up date which may correct the problem.
If the above does not help, I would contact Moultrie.
Moultrie recently advised contacting them by telephone due to their heavy work load. They informed me they had extra staff manning the telephones to help over come the excessive emails. I have had excellent customer service from their company.
I have the Moultrie GameSpy M100 and I am able to use the following brands of SD cards: Verbatim, Sandisk, Adapta and Lexar. All my cards are formatted in my computer before installing in my cameras. These cards are used in other cameras as follows: 2009 model Bushnell Trophy Trail camera, Moultrie D55-IR, SpyPoint IRB. I had used them in the WildView EZ Cam until I sold these, switching to cameras that would take video.