many cams can get picky on SD cards, both size and brand name

I would recommend you clean the circuit board really good , each contact, with a
Q tip and come alcohol , and also clean the contacts where the SD card goes in
also DO NOT turn the cam on without a SD card in the slot
it seems to cause brain damage

NOW< another thing you can do after you clean all the connections and BEFORE you add battery's is
take whole camera and place it in a zip lock baggie , then fill baggie to cover camera with dry rice, seal bag, and leave it in there a week or so, , the rice will such out moisture, you will miss just wiping it down or placing in the sun even!!


after this, you can try again with a new SD card
IO have had best luck with 2-4 gb Sandisk brand made cards

IF all else fails
and before tossing cam
and IF your brave

I have heard of a few folks bringing back to life DEAD cams by , pre heating your oven to 200 degree's
placing cam on some aluminum foil on a cookie sheet and baking it for 15-20 minutes
THEY say, its NOT hot enough to melt plastic, but does start to warm the solder on the connections, and causes them to make new contacts!!

as I said this would be the LAST ditch thing I would try

its NOT the best cam out there, so, its NOT a total loss


ON a side note, over the yrs I have had a LOT of cams stolen off me

I had one once that was stolen in summer time, and the thief, brought it back in mid hunting season, threw it under one of my stands, after he broke it??

I Guess to be a jackass or??

so never know what makes a thief tick!