Support sd card doesn't save anymore

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http://androidforums.com – my sd card has been working perfectly for a while, until a few days ago when i went to download the MyNBA2K app from google play. while the app was installing my screen just randomly went black and my phone restarted itself. none of my songs, photos, videos, apps or anything got deleted but now all of a sudden i cant save anything onto my sd card anymore and i also cant download anything onto my phone anymore. is there anyway i can fix this? or do i have to buy a new sd card? can someone help me please? (General)