NEC ND-3500 16x Dual-layer does not recognize any DVD



I have NEC ND-3500 16x Dual-layer, black , since last week my DVD burner does not recognize any DVD, but can read and write the cd’s. I had try almost everything without result .the problem begun last week ,when I try to open the drive manually, which the drive was unable to open automatically. So any help would be appreciated.


Try the drive in another computer…
If that wont help, probably the DVD part has failed.