Both HP DVD drives stopped working suddenly

Newer PC with two HP dvd1270 drives, W7pro. Recently I discovered that neither appears to work. If a dvd or CD is inserted in either drive, the drive light comes on for a few seconds and then nothing. The drives do not show up on my COMPUTER page but they do appear in Device Manager. Whatever happened to them, it appears to have happened at the same time. Any thoughts?
 
Sounds like a DVD filter driver problem. See [post=815753]CD/DVD or Disk Problems? How to Fix Problems Caused by Filters[/post]
 
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