I did burn another copy with 2x speed. Nothing changed, I still
have totally blank screen.

Does it matter if I use RAW DAO or SAO etc. when burning?

Are there any other Alcohol 120% settings that should know about?

Like I mentioned before, I already tried a friend's V27 version
which had worked fine for him. It didn't work for me.
If I keep trying, should I try with v28 (which I tried originally)
or other versions?

Anything else I could try?