ds lite &r4i card help on menu ?

hi does anybody know what ive done and can they please help xx ive got a r4i card for my ds lite games were already on working great untill i took out games i didnt play on to put new ones on i think i could or would have took of a important one ive got a thingy thing with lots n lots more games to put on my ds whenever i need to bot i dont know what im lookin for as when i turn on mi ds on the top screen just menu comes up in a red box and nothing else happens no matter what buttons or the screen i touch xx i appreciate any and all help x xthank you xx