What a way to begin.... I've been lurking here for several weeks and have had my Phantom for almost as long. I've found it easy to fly and operate until this morning. I had installed the prop guards (training wheels) for the first couple flights in order to save on any mishaps; everthing was good. I decided to remove them a couple days ago and haven't had a chance to fly until this morning. I go through the normal power up only to have all four props studdering with little power. No additional power from the controller. I chacked everything and the only thing thats changed it the screws being put back in place after removing the guards. Too tight? I went through each motor tweaking the 2-screws and got first 1- then 2 working as they should (both clockwise) the remaining props are still studdering or not turning at all with no light on under the arm. What am I missing? Thanks in advance for any information. I bought this from B&H and they CS is less than good so I turned here for help.