Ps4 slim disc drive not taking discs at all

Hi my name is Tiliy I need some help with a issue my friend has had on Tuesday night he was cleaning out his ps4 slim as it has been dusty from never cleaning it out and he pulled the disc drive and everything else apart to remove the dust out and all of a sudden his disc drive hasn’t been working since the first thing that had happend was it wasn’t reading discs and he pulled it a apart again to see if he missed a peice and now it won’t take in the discs at all everything is all connected and in place so I’m just wondering if there is a way to fix it or what it could be since that night hope to hear from you soon :slightly_smiling_face: