Hey Hi, it's pretty simple you see. I have this same printer.
It's called Cold Reset, you can google it if you want.
What you have to do is when it's powering up, you have to press and hold the GO button for few seconds until the Attention LED comes on solid.
The printer will cycle through the LEDs once the GO button is released.
The print will go back to its original state after the cold Reset is complete.