Compaq Presario R3000 PC
It appears without looking at the laptop you have removed or dislogged the cable that goes between the motherboard and the screen. This is not hard to do they are very delicate. The only thing you can do is take it to a qualified service tech. i get these periodically in my shop too. Check the cable before you do so to see if you can reconnect it but be very carefull.
Be mucho blessed,