Wow here's a shock another bug Ive experienced with FO:NV. Boone decided to go his own way inside vault 34 and got stuck inside a cavern wall, whats worse is i can't take him off my party or kill him in hardcoe mode, does this mean i have to restart the game again or is there a simple fix? I would like to think of myself as a patient person but this is ridiculous!!!!

Did you already try leaving the Vault briefly to see if he materializes beside you after the loading screen? Or Fast Travel somewhere (same idea). Or do the elevator trick (Vault 22 elevator I think it was). However, in the short-term, usually npc's will eventually unstick themselves if you stand far away enough that they're trying to follow you. Just takes them a few minutes.

If he's been stuck for many game-days or something tho, that's different. Outside of the elevator trick and fast travel/time, no real fixes on consoles I think.

I've had a little experience with characters getting stuck in walls. The only thing that brought them out of it was when the game suddenly needed them elsewhere. For example, The King got stuck in a wall for ages on mine, but later on a completely different quest required him to be somewhere else. He popped up there where he should have done and has been fine ever since.

I don't know if this helps. Is Boone currently following you? If so, surely there may be some moments when he is required to speak to you. I can't think when and where off hand. Perhaps try shooting some NCR. That always upsets him, haha.

Just as Lady Crimson said, try to fast travel or to use the Vault 22 elevator.

vault 22 elevator was the trick thank you very much

Your companions are NOT essential in hardcoe mode, they can die.