My micro sd in my huawei ascend won't read?

i put a micro sd card i had in a samsung messager touch i had that had mp3 songs and wallpaper in my new huawei ascend after i took the micro sd card that was in it out. the phone didn't recognize the micro sd card that had the stuff on there so i put the micro sd card that came with the huawei ascend back into it now the phone won't read that one either