SD card

[ImLostAgain]

My wonderful grandson has messed up my Sony Ericsson xperia mini.
All the info has gone. Whatever I try to do with it now I get the message, no SD card, or, please insert SD card. It also does not recognize the SIM.
I have removed them and put them back but it still does not recognize them. I tried them in an old mobile and the worked no bother.
Is it gone for good or is there any hope?