From the picture it is quite certain that the rightmost pin in the lower row is bent. I am wondering how it is even possible to insert a lead, as you must have done if you have seen "a faint ghosted image".
The frame around the connector is also clearly bent, but this does not necessarily mean it wouldn't work, if there is contact in some parts of the circumference when the plug is inserted.
The first attempt should be - with the power off! - to try with a narrow set of pliers or similar to carefully bend the pin back into position. If you can then insert the cable fully (don't worry about not being able to screw it into the left nut, one side is more than enough, as long as you don't wiggle it too much around), you can try turning on and see if it solved the problem.
If not, you are probably looking at having somebody skilled open it up and look for further problems, e.g. leads having been ripped off the inside of the connector, broken leads inside the machine, etc. etc. - you could also have a defective cable, so maybe try another cable first.
Best regards,
Niels
