Ok, I know this is a newbie question but I'm a heli newbi sooooo

If you just apply throttle shoud the swash plate move at all?

I crashed and broke the landing gear socket on the airframe and bent the main shaft. I replaced all the broken parts and reset-up the Blade using bdavidsons instructions in the build thread. I believe that I got everything back togeather and adjusted properly......but....now it won't fly.
Everything is smooth and vibration free up until about 1/2 throttle then the swash plate starts tilts forward and an odd deeper humming sounds starts. There does not appear to be any vibration at this point but it sounds like there should be. This noise continues up to full throttle and the heli will not lift off. If I work the rudder control around it will sometimes jump up and go into forward flight but does not do this with any regularity. I have checked the main motor gear mesh, the swash plate to be sure it is square to the main shaft, checked for binding of the swash plate and rotor head (other than new blades I did not work on the rotor head - it has the 3bb update) and checked the controls on the tx, the trims are centered, verified proper rotation of the main and tail rotors and checked the tracking of the blades, the gyro and gain could still use some tweaking but mostly holds the tail steady and I've checked the batteries in both the tx and the heli for full charge.

At this point, I'm still too new to know what else too look for/at. So, if anyone has thoughts on what I should look for or what I may have missed, I would appriciate the input.

Thanks
Dave