the extruder and bed will not move

I was having lots of problems with my sd3 so I sent it in to Solidoodle so it could be repaired, lots of problems with it. After I got it back from Solidoodle with a new mother board I hooked up the printer when I got home but my pc did not detect the printer. I disconnected the printer and reconnected it but still no com between the printer and pc.

I figured it has a new mother board so I reinstalled my Repetier host. After the reinstall I tried to connect to the printer again but no joy.
Command line reads “ the parameter is incorrect”.  So I took a look at my settings I did not see my com port.  Did a reinstall on all software this time I did get the com port, I hit connect and the printer connected.

I then went to move the extruder and bed to home and the command line now reads “ N6 M105 1 echo: unknown command”. The extruder will not move nor will the bed. What do I do now?