775 spindle always on

I'm new to the forum and i just bought a 3018 cnc.i use grbl 1.1 and ugs,i have 3 nema 17 small sized motors(i dont remember exact specs..)and a stock 775 spindle with 10000 rpm.i made a z probe plate,o probed alright with no problem but when i started to surface my plate the cnc went on hold with no messages and since then the spindle is stuck in on position no matter what i do.any help wether it is a software problem or a fried mosfet and any possible solutions welcomed!attached is my board