laptop works but refuses to display

My Sonny PCG-FX250 laptop P3, mistakingly fell from the table. when i put it ON it will indicate that its working but it wont display on the screen. i tried connecting it with an external monitor, it refuses to display as well changing the RAM, CMOS BATTERY and the PROCESSOR to no avail. Pls help me on what next i should do URGENTLY. Thanks for ur mutual cooperation.