Can't open a DVD/RW or DVD/R on my DVD/CD ROM Drive

  On my 8400 for some reason, all of a sudden when I burn a DVD/RW or DVD/R on my Plextor 712SA Drive "E" and try to open it up in my DVD/CD Rom Drive "D" the burned DVD is not recognized. The DVD/CD rom drive would green flash for about 15 seconds and then just go out.

  If I go to My Computer and click on the D drive all I see is an empty page. I could open these DVD/RW & DVD R on my "E" drive where my burner is without any problems. I also don't have any problems reading CD/RW or CD/R  thru the "D" drive. It just looks like my DVD/CD Rom drive is not recognizing my DVDs.

  I've been using Fujifilm and Maxell DVD/RW and Taiyo Yuden DVD/R. At one time everything was working, unfortunatly I haven't a Restore Point for that time.

  Any suggestions.

                            Thank you

                               Andrew