The DVD makes a growling noise?

Yes it's true, it makes a growling noise when it's first turned on, then after running for about 30min it becomes almost completely quiet.

Background: The player got a disc stuck inside of it and my best friend (against my wishes) took it apart to retrieve the disc.
It's been making this strange noise ever since.

got any ideas? this a 1,000 watt surround sound system by Koss.

thanks Ken