Hi everyone! I'm having trouble trying to find out why my DVD drvie that came with the computer suddendly stopped recognizing DVDs, it wont read them at all...!

I bought a hp Pavillion 750n and the DVD drive is a SAMSUNG DVD-Rom SD-616F. As far as I can remember it was working fine some months ago, and now that I've been trying to use it again to watch some movies it just wont run the DVD. I have even tried some of my old DVDs that I use to use with and not even those run. Im guessing is not the DVDs, but something that has to do with either the drivers of the DVD drive or hardware itself (DVD drive).

I have tried the troubleshooting process and find that the drive is working properly, but it doesnt mention anything about why is not reading the DVD movies. Any ideas, or suggestions on how to troubleshoot it, will be more than appreciated.