If it was stored in a hot and cold enviroment it is posssible that it has gone bad. If you are sure you have it correctly installed that could be the possibilty. You could try the freezer trick* on it, but that would only confirm it's death. Also check the makers website for none issues.
*Freezer Trick = Put the card in a ziploc bag and then into the freezer for about 20 minutes and then put it strait into your computrer and check to see if works now. If some circuits no longer work then they would expand as they freeze and rework, temporily.