Movies I put into my laptop won't play anymore. What do I do?

I used to be able to put any disk - movie or video game - into my laptop's disk drive, and it would work; now it doesn't.

I sent the laptop to Lenovo a few weeks ago because of a hard drive crash, to which they replaced with a new drive. Is it possible they could have done something?

If not, how can I fix this issue?

Added (1). I don't get any error messages of any kind. I put a disk in, and it whirs like it's going to do something, then it stops whirring and nothing happens.

Do you get an error message when trying to play the video?
Please provide more information.

Pretty normal. If that's a new installation of Windows, your laptop doesn't have Flash installed yet.