Power off the desk.
You need to remove the two reset wires from the PC Motherboard power/reset/led connector block.

The motherboard power/reset/led connector has connections for the power led, hard drive led, on/off and reset switches.

The two reset wires are in a black sheathed cable (normally with a cable marker '3').
These two wires should be pulled from the connector block taking care not to disturb the other connections.

The cable should then be pulled through the cable ties and removed from the desk.
 

For your information, the opposite end of the cable terminates near to the EZ-DMX board on the base of the desk, but will not be connected (see photo below).