PSP The disc could not be read-

SONY PSP problem UMD read and see,laser click-click when tourn On after that put disc PSP not active tasters and "The disc could not be read" .Please help me fix the problem. PS. Dear, after one fall my PSP console tries to load UMD disc, no matter does it inside or not. The same error occurred when I try to insert UMD disc, and then i received the message: ' UMD disc could not be read' . The sound of motor is present exactly as it present on video shot. I would like to ask, what can cause that problem? Mechanical damage or something different? Thank you !