Not properly displaying video

Reacenty I received a used PlayStation 3 from my destructive cousins. I brought it home plugged it in and nothing. I tried using both av and HDMI and neither have worked. After doing online research I tried many things that are supposed to help yet nothing has worked. Some things I tried that failed were, resetting the graphic card, changing the HDMI output, and using a new tv. Nothing seems to work and I would assume that there is a hardware problem please help it is much appriciated.