I am assuming that there is no warranty on it. I am also assuming you mean those pretty insane ribbon cables that are like cut cables that have plastic snap downs that sometimes do not connect properly. You probably will need to Google you-tube to see if someone made a video on fixing that model. Otherwise you might need to open it back up and see if the ribbon cable is loose, re-seat it and try turning it on to see if it works before closing it up again.
If that doesn't work you might have to purchase a new one. I hope that one didn't cost a lot.