LdyMox is on the right path. However, are you still on the stock hotend or did you upgrade?
I have experienced this:
*After my fumbling attempts to flash firmware for my E3D #ihateprintrboard
*Before upgrading my PSU
*If I was running a program in the background that gobbles RAM (Cubase in my case)
*A single loose wire
*Board was getting hot...resolved by adding a fan
Retrace your lines to make sure everything is connected. That is the fastest and cheapest start.
After that, you could try plugging into a different USB port. I read of a user on another site who said this worked...but he was using a different setup...Prusa and Mac I think.
If these don't help, try giving us as much info as possible. A screenshot of the error codes and the temp chart will help us alot.
Printit Mason and Printit Horizon printers
Multiple SD2s- Bulldog XL, E3D v5/v6/Lite6, Volcano, Hobb Goblin, Titan, .9 motor, Lawsy carriages, direct Y drive, fishing line...the list goes on
Filawinder and Filastruder #1870.....worth every penny!