I am using a Dell Latitude D800 laptop. It came with a NEC DVD-RW ND-6100A drive which I flashed to become a NEC DVD+-RW ND-6500A so it now has + and - support. Then I upgraded the firmware from 2.22 to 2.24. The problem is I cannot view any DVDs. The DVD in question is region 0, and I have Regionkiller so it should not matter anyway - this shouldn't be a region issue. When I attempt to play the disk, all I see is a black screen, no audio, nothing. If I scroll forward the computer gets a system error and I am forced to restart. The DVD works on my DVD player connected to the TV.