Do you have a volt meter?
The fact that the hot-end temperature is showing room temperature means that the thermistor is working. That leaves either problems with power going to the heater or the heater itself.
Pull the Heat1 connector out. Stick a couple of pins in the end and connect it to a volt meter. Be sure the pins don’t short out our you could damage the controller board or the power supply.
With the meter set to voltage, turn the hot-end heat on. You’ll only have a couple of seconds before it aborts but it should be enough for you to confirm that the cable is delivering 24V.
Also, I don’t know the pin assingments on the black connector (bottom of board), but it looks to me that the connector isn’t in completely on the left. If the power to the heater goes down the left side (and the left-most wire is thick enough for it), then it’s possible that that’s where the break in the power delivery is.