DVD/CD RW drive not recognized by Windows 7

Since buying this laptop (HP Pavillion DV7T) I have had trouble with the DVD/CDRW drive not being recognized after a shutdown.  This is an intermittant problem with no traceable cause.  To fix this issue I have tried the following:  Assigned the DVD/CDRW with the letter Y in case there was a drive conflict causing it; used the troubleshooter offered by Windows 7; uninstalled and reinstalled the drivers; checked for updated firmware.
If I run a scan for hardware changes, the drive shows up again, but only until the problem reoccurs.  I am seeing this problem about 4 times a week.  This issue will occur on about every other hard reboot, again, no real pattern that I can identify.
I have made a change to the system.  I had to disable all hybernate options due to the "power state failure" bsod that I was seeing.  I don't believe this change would cause any issues with the optical drive.

Have you tried MS Fix-It?
http://fixitcenter.support.microsoft.com/Portal/Wh​yFixIt#Easy
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