hi there, i am having a problem with a canon D 880, the problem is after removing the back plate to access the pwb to see if any additional memory can be added / after putting the back plate back on NOW THE MACHINE WONT TURN BACK ON i dont see an ON / OFF switch on the machine its getting power (small led on main board is on ) but no fan or display etc.. does anyone know if this machine has an interlock switch to power up because it worked fine up untill i removed the back plate (and machine was unplugged before removing back plate. appreciate any help and as allways thank you in advance.....