sim card not detected after flashing
 

i just dropped my n900 accidentaly, and at first stucked at the nokia logo so i decided to flash it and it went fine but the problems comes that it doenst detect the sim card, i searched for a ploblem and i just ran through some of them like to put peace of paper xo the simcard place so it will be more tight but it failed to detect a line, so any one with an idea or some sort of help, i will appriciate in advance,


sorry for my english