OK, try this, nothing to lose.
Find the two white wires leading from the power inlet board to CN2 on the main pcb. In my experience these wires are a "wound on" fit to the pins next to the fuses. Unwind the wires from the pins and then re-attach them by soldering. Please get back to me with the outcome, positive or otherwise.
Find the two white wires leading from the power inlet board to CN2 on the main pcb. In my experience these wires are a "wound on" fit to the pins next to the fuses. Unwind the wires from the pins and then re-attach them by soldering. Please get back to me with the outcome, positive or otherwise.