Did you check with the support for the computer? When I got my notebook they indicated that they recommended DVD R+ and the brands, Sony, Maxell and TDK; actually I haven't tried a burned DVD R- as my external burner supports DVD R+ and the same brands of disks that I mentioned earlier.
if you can it would be good to contact the support people.
just an idea, as that is what i did. if that fails phone a warranty depot and speak to a tech there as they should be able to help.
i have done this myself before and solved the answer to my question.