Just finished building a 450 with naza lite w/gps.  At the end of system check only 3 green leds blink.  It says to contact DJI.
   Its Thanksgiving eve and want to fly it tommorow. Any help?

I have the same issue and was about to post the same question.  My 450 seems to work O.K. but I am concerned that there may be a problem.

it is totally OK, 3 or 4 blink of green light are both normal.

Thanks for your help

Very good to read that.   I have the same situation on my Naza M lite.  Just 3 green flashes.  

Please DJI, correct the manual telling 3 green or 4 green is ok.  
It is pretty easy to update that at DJI home page.  And will save a lot time of users looking for this answer at the net, or avoid users grounding the copter afraid of flying .

Besides, the instruction manual is VERY clear telling " IF  the FOUR green flashes are abnormal, contact DJI . "    that is quite scarry

Once more :  Please DJI  update the instruction manual .