samsung galaxy s3 white unlock new +

galaxy s3 white new only boght weeks go i drop the phone and there is small crack insaide the screen but is not noticeable touch has no scratch phone looke new i have box all the accessirres sreen is blank when u try to power on but blu light shows and you can recived call no problem i dont know what is the problem it could be minor or could be need to ching screen so i describ avrything cleary so please dont wast my time reead the ads forst then call