CD Shutdown

For some reason, I am getting messages the I have unplugged my CD-RW and if not right away, soon followed by one about unplugging my CD-ROM. I have not initiated any action like this. My Computer then does not even recognize either device. I have in the past couple of weeks just shutdown and restart, but today they aren’t even showing up after a full restart. I have a Pavilion xl754, 2kP w/ Off 2kP.
What on earth is going on? How do I keep this from happening?