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I just played in a game in which my opponent had a Grey Knight librarian. GK librarians can all use 2 psychic powers. He attempted to case Might of Titan (a non-shooting psychic power) but failed the 1st time. He then cast it again and succeeded on the second try.

Most of the opponents I have played against usually play it that you can. For example, when I played against Mephiston, who can cast 3 powers a turn, usually when he fails a power such as Unleash Rage or his force weapon, my opponent just tried it again (actually, now that I think about it, I've played both against opponents who tried it twice and those who only attempted it once even though they failed their psychic test). Another common application are librarians (and grey knights) who try to re-cast Null Zone (or Hammerhand) after failing the 1st attempt.

My question is, is this legal? Can you try to cast the same power (as long as it is not a psychic shooting attack) more than once (assuming you can cast more than 1 power)? Also, even if the power is successful, can you attempt cast it twice (i.e. casting Might of Titan on 2 separate squads)?

Thanks.

The only type of psychic powers you are limited to only casting once per turn are shooting powers or any that specify once per turn. So yes recasting failed tests and using the same power on 2 units is allowed.

Page 50, Introductory Paragraph and Psychic Shooting Attack.

RAW states you can only use one psychic power per player turn. While that may be interpreted along the same lines as "using two powers," it could also be interpreted as "using one kind of psychic power."

The latter may be the actual case, because right next to it under Psychic Shooting Attack, it states that even if a psyker can use two powers per turn, he cannot use the same psychic shooting power twice in a turn.

However, this may only truly apply to shooting powers (which I'm sure you've speculated), and that non-shooting powers are, per se, multi-useable.

My guess is that you can use a non-shooting power more than once. If they went out of their way to state it for shooting, its possible by not stating the "obvious" would mean its okay.

PS: I'm not 100% certain, but I think Force Weapon attacks can only be attempted once, since it says A psychic test.

As far as force weapons go in the GK codes it says you take the psychic test after the first unsaved wounds are caused and all weapons in that squad are either activated or not based on that test.

so no i don't belieive you can attempt to activate force weapons twice as they always bound to the result of the initial test

RAW - by default you can cast ANY non-PSA power as many times as you like.