I Urgently need help! D:

[singsomethingxx]

Hey everyone. For my birthday I got an EOS Canon Rebel XTi and it worked absolutely fine until yesterday. Now, I go to turn it on and it doesn't. I didn't think anything of it because I figured I left it on like an idiot and the battery was dead. So I charged it for several hours and I go to turn it back on, it still doesn't. So I take out the memory card, turn it on again and it works fine and I can take pictures. Again, I attempt to put the memory card in and it like doesn't fit, but the little latch thing closes. And the camera just doesn't turn on and it froze when I tried to turn it off. I just tried again and it turned on with the CF card in it, and it said, 'there is a problem with the cf card. replace the cf card.' Does that mean there is a problem with the camera or the cf card?
Thank you for any help I can get! Oh and it would be helpful if anyone could specify what I do to fix the problem and if I need to send it in for repairs.

[JT]

Error code 02? You could try formatting the card through the camera menu, if you are able to access the menu with your problem. I believe you can also reformat the CF card with a card reader for your computer (if you have a card reader). I would try a new CF card if you can, and see if the problem was due to the card you currently have.