Isn't that a laptop? Anyway I reckon that you have have done one of two things:
1) Broken your Hard disk drive. (If the date is really important it can probably be recovered - at a price!
3) Dislodged some connectors. If you are skilled at laptop repair then download a manual from Panasonic and go from there or if you are not, take it to a repair shop.
T, September 2008