Based on the context and the answer, generate a question. 

Context: Stef 's DVD player sat right on top of it , completely covering the vents . I put small boxes under the DVD player to raise it up and unplugged the box to let it cool completely down , but to no avail . I called Comcast and they said that should n't matter .

Answer:

It is overheating .



Why may the DVD player be no longer working ?