Hello
Attached is user guide that has trouble shooting from page 58.
I recommend that you POWER OFF and do some cleanup FIRST. Most issues are due to CPU fan not working or CPU heatsink full of dust etc. Also clean up the tracks & leadscrew & oil them (DO NOT oil z axis lead screw). Check all limit switches are working by say using multimeter.
Then power-on and then follow the troubleshooing from page 58 of manual (atttached).