Another DVDRW not working

Ever since I installed Windows 7 (64bit) (Monday) my six-month-old Lite-on dual layer LH-20A1L DVDRW burner can't be used as the tray fails to close. It opens and closes during boot up, then stays open. Device Managere reports all is well, various driver sniffers report drivers up to date. Silence from Lite-on. Google search has produced nothing. Any ideas other than installing the burner in my XP computer?

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