Z axis Not working well

Hi all!

I'm a little confused, I do not understand it anymore!?

My printer is now printing half-prints?
And in Repetier host when I go manually raise the Z axis,
he does then turn a little but then suddenly stops and go buzzing.
small steps goes well but if I want more rotation They turn a little piece And go buzzing

I have tried differend types of marlin.
The machine is a self DIY Prusa i3
(Has orked well?) From one(small) problem to another to this this problem???
I have exchanged 3 times the Arduino, Ramps(with all the stepsticks) and LCD
the Z rods are M5
The values in marlin for the engines
First I had 80, 80, 400, 770
Then I tried 80, 80, 2560, 500 (I had seen those values on YouTube.)
Then I tried 80, 80, 4000, 500

I have done the extruder test (100MM) and must actually the value of 500 Must be 770
but the Z axis problem I find more important

I hope it's all understandable
friendly greetings from The Netherlands!
Rob.