My ps4 crashes when I try loading a game

I bought a used ps4 from my friend. i after a month of i noticed that it tends to over heat. after some research I found that it probably has a-lot of dust build up. so I opened the device up and took everything apart and cleaned it out. so now with the device clean everything went well until i tried loading a game. the ps4 crashed and the led on the controller lit read then turned off. everything else works on the ps4 like downloading games, streaming videos, and ect. I'm not sure what went wrong