Hi guys (gals too I'm sure)

I have a problem, I'm sure it's been on here before, but I'm too lazy to search 75 pages of posts for the answer.
Here's the problem. I had a fairly minor crash tonight. broke one of the blade grips (nothing new here). I reassembled everything and went back out to check my handywork. motor spooled up normally but wouldn't take off. Cyclic worked fine, could see rotor disc move with the inputs, powered down and tried again. This time it took off at half throttle...so far so good, gets about 2-3 feet in the air, seems to be hovering fine, then all of a sudden drops like a stone, hits the ground, then bounces back up, does this twice more before I can get the power off. I shut it down, replaced another broken blade grip, and tried again, same trouble...any ideas??? I've been flying for about 8 months on the axe, and over a year before that with a blade, never seen anything like it.