mach3 wont reset keeps saying external emg stop requested

[JAZZCNC]

Ok regards the PS controller that's about what I expected because it's just software driven and your problem is hardwired. So, unfortunately, you are going to have to do a bit of detective work and start tracing wires.

Now because the Home SW doesn't work and Spindle won't start I'm thinking your problem could be the BOB(breakout board) and it's I/O (input/outputs).
Looking at the pictures I'm pretty sure this breakout board needs a separate voltage source for the I/O to work. The pictures also show 2 PSU, the smaller one will be the low voltage for this and the relays, etc, the large one for the drives. So first check you are getting power out of the smaller PSU, it's probably 12 or 24Vdc.
and that it's getting to the breakout board.

To be honest I'm quite confident your problem lies here with the voltage to the I/O but if you are getting voltage to the BOB then I'd 99% say your BOB is dead. But it's always worth tracing wires for damage or loose connections.

After this I can't be much more help without being infront of the machine.

EDIT: The two middle connectors on this block is were you need to test for voltage. 3rd from end near USB is Gnd and 4th is Vcc.