DVD/RW Drive Missing

I made the mistake of letting my sister-in-law use my computer (the one I use for work) to burn a CD. I thought she said burn a DVD, which is something I do all the time. However, apparently she downloaded a CD ripping program called CDEX (very legitimate -- doubtful of any viruses). In the process of ripping her CD to the desktop, the program froze up. The disc would not eject from the disc drive. So she called me over -- I couldn't get it to eject, either. I tried restarting the computer, but to no avail. I stuck a paperclip in the slot below the eject button and manually opened it -- but now my disc drive is gone. This is a new computer -- not even one year old yet. It's a Vostro 320 all-in-one desktop. It has Windows 7 and this is a DVD/RW drive. It is gone from the device manager completely. When I push the button to eject the disc drive, the light flashes green once, but never opens. If I manually open it and put a CD in there, nothing happens. It doesn't spin around like it normally does.