I would strongly recomend against changing GRBL values if you not sure what you are doing
$RST=*
Press enter
So all reset to factory defaults
notice
You are asking the machine to start CENTER center
However i can imagine you just homed mahine
So machine “THINKS” its at X0 Y0
You ask it to start from “CURRENT POSITION” therefore x0 y0
And go into negative X and Y at least 100mm
it wont do it, will alarm 2
If you want to do the above, i sugest you jog machine to X200 Y200 first
Dead ccenter
Then adjust it by hand. THEN use current positiong center center