The print doesn't start centered

I have tried everything, reslicing the piece with Cura in Repetier, reloading the firmware, nothing works, the print do not start in the center of the bed which is a big problem for over hanging parts. It starts stuck to the left (0) of the X axis.
Anyone has a solution?
I am turning nuts!

Check my answer in your other post : http://forum.velleman.eu/viewtopic.php?f=61&t=14654.

In the future, avoid posting the same question in different threads.