try to format the memory card from ur phone and check by connecting it to computer and insert some media files .,if visible. If not visible , buy another card
what error is prompting when you attached your mobile phone through your PC. If you are not able to access this card that means your card is damage, I advised you to format it and still problem occurs then Need to change Memory card.
when i switch on the phone ,it will briefly show nokia symbol and goes white even when i switch off...
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when i switch on the phone ,it will briefly show nokia symbol and goes white even when i switch off it does same.