I got a friend who brought me his v5 PS2 for a possible repair.
The problem is that his PS2 boots PS2 CD-based backup games but doesn't boot DVDs whether DVD movie/game original or backup.
So I opened his PS2 and found that he has a "Magic III", that was the label on a small red modchip. I haven't seen a Magic chip before so I'm not sure, correct me if I'm wrong.
Also, I found that his PS2 does not read PS2 CD-based backup games burned at highish speeds proven to work on my own DUO modded v5 PS2 but his PS2 reads PS2 CD-based backup games burned at 2x.
So according to the preceding symptoms, is it more likely to be an install problem or a laser problem? Thanks.