Ok, so basically i started the game and did virtually everything that would give me NCR fame. Funny thing is i never got beyond NEUTRAL reputation. At first i just thought that maybe it was just harder to gain fame with that faction, because it was one of the main factions. As i kept doing things for them i still noticed no change (i've done the mission for Ghost at the mojave outpost, the unlisted mission for ranger andy, the mission where you clear out ants for the head of the mojave outpost "Can you find it in your heart", and finally i did "Restoring Hope"). After doing "Restoring Hope" i realized that something must be wrong, because this was a hell of a feat to not even get accepted by doing it, but on top of all of the all the other times i'd gained fame/done something for them i'd not gained reputation either. I saw something about the "faction disguises" when i looked up this problem, so i reloaded a save before i finished "Restoring Hope", and finished it with no NCR gear on what so ever, i gained fame and i still didn't move past NEUTRAL reputation status with them. What the hell is going on? This has to be some sort of glitch right? All i know is that if this character is screwed then i think i'll have to put down the game for good because i've already put over 30 hours in the damn character and this kind of thing is a real mood killer.Thank you in advance to anyone that can show me something i may have missed
PS i still haven't gone passed boulder city, i'm still just doing side missions for the most part....which i was enjoying

this is too bad...are you dressing some paticular suits? i mean if you are wearing the legion dress..not sure about that.

it wasn't until after boulder city that i got past neutral rep with the NCR. i did one or two more quests for them after that and i finally was accepted or whatever the next rank was. but they were definitely the faction i stayed neutral with the longest, despite trying to gain rep with them for a bit.

I had sort of the same problem, whenever i approach boulder city ncr shoot me up. And my reputation with them is neutral :/

It's no like they're attacking me, it's just that i'm not gaining any reputation at all. It's just really annoying like they're treating me like a random person after i've done all this stuff

So are they just harder to become neutral with or am i screwed?

The game and its manual does a absolutely horrible job of explaining reputation. However, there is a series of scales indicated in the game guide that gives more info. Your reputation, at any given moment, is a combination of both your fame and infamy score. It is not a single scale that moves either direction, but instead your fame scale can increase and your infamy scale can increase, but neither scales can be reduced. Once you get infamy or fame, you are stuck with it for the entire game (exception is the pardon from ncr and legion after entering the strip). NEUTRAL is the first level on all three scales, the three scales being, EVIL, GOOD and MIXED. If you have done something to the NCR that gave you INFAMY, and the amount of INFAMY you recieved is substantial enough, you may never be able to go past NEUTRAL, no matter how much good you do. In my game, I killed som many powder ganagers, that even when I helped out at Vault 19, the best reputation I could get back to with the powder ganagers was Merciful Thug, which is a 3 on the EVIL scale. I will never be able to return to a MIXED or GOOD reputation with them as the game has no more quests for which to get FAME with them. Remember that siding with the Legion in certain quests, will at times, give you NCR infamy.

Not sure if this is where you have ended up, but perhaps it will help.

I have the opposite problem where I was idolized by NCR and hated by the Legion and then after saving Kimball I'm now neutral with both. I was planning to use the same character to play out the NCR and independant choices so I hope I'm not screwed.