Condor XC-MINI tech support from xhorsetool.com:

When it is powered on, the lights will stay on but the screen will turn off. I have to let it sit for several minutes before the screen will come back on.

Solved!

Put down the machine and take out those screws like picture show

Take out that power board and check the output voltage if it’s 24V in the position like picture show ( mark with circle) , if not ,check the input voltage ( mark in arrow ) if has 110/220 V ,if input voltage is normal ,which means the power board is damage ,

Have fun!