It's hard to know what to do!
Either the drive has suffered some kind of mechanical failure or it hasn't. If something inside has broken, it's probably not worth trying to repair - unless you're particularly attached to this drive for some reason.
If you try taking the drive apart to take a look at its innards, you may land up ruining it even if it wasn't ruined before - though if you're careful and don't power up the drive with the covers removed (because of the laser beam), that might be another way to handle this.
I'd try inserting a worthless disc (if you've got any coasters, AOL or Freeserve discs, one of those would do fine - alternatively try a blank CD-R) and be ready to pull the power in case anything dramatic happens. However, depending on what sort of noise it made, I may well take the drive out of the case and shake it first to see if I can hear anything rattling around inside.
I doubt a 16x10 writer will be able to spin fast enough to 'explode' if a disc breaks inside - supposedly you have to spin a disc faster than 40x for fragments to be ejected out of the drive.