As there is nothing intrinsically scary about darkness or blackness (after all, we have our eyes closed when we're asleep), my sense is that what your friend is experiencing is generalized anxiety. That is, he is not distracted by people, TV, etc., so anxiety sets in, and he experiences it as fear of darkness.
I would suggest looking into types of meditation that might help him figure out what's bothering him. The type I often recommend is the "Thousand Petaled Lotus" which is in some ways similar to Freudian free-association. But it is also important to be relaxed. Most types of meditation are calming, but as he gets afraid when his eyes are closed, he might try focusing on a mandala.
--- In firstname.lastname@example.org, "dlonepilgrim" <dlonepilgrim@...> wrote:
> Hi, I am new here. A friend who has started meditating about 2 years ago, came to me with a problem. Since I have never experienced this, I could not explain it or help him. May be someone here can throw some light on this.
> He seems to 'see' or experience absolute darkness or blackness while meditating, and gets frightened.He is not able to continue because of the fear.