Drone won't lift off

I have a quadcopter that's been flying fine until recently I replaced two blades, but they were apparently put on the wrong ends because the drone wanted to lift only on one side. I readjusted the blades and now it doesn't want to lift only on one side - but now it won't lift at all. The blades spin fabulously, but I get no lift-off. I don't know if I need to rotate the blade placement around or what, and the manual doesn't address this issue at all.

Any suggestions?

 

Most quads follow this arrangement, you didn't say what you are flying.

 

It worked! All I needed to do was rotate all the propellers clockwise one position.

Thanks!