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If what you're describing a black metal screw with needle pin- this would be a coaxial cable for cable TV. However that would not prevent the TV from turning on.
Are you saying the TV will not physically turn ON or that it turns on yet with a black screen?
Additionally, if you grab the original Vizio remote and press MENU, does the set's own MENU show up?
Any way you can take a picture of that cable you're looking at and post it on this page (using the paperclip icon to upload from a PC)?
Please view the page and reply back to proceed.
If this is in fact, a screw on/threaded cable with a pin sticking out of the end, it would plug into the jack labeled "DTV/TV" on the back of the TV and it screws onto this jack. The jack is also shown on page 11 of the manual at the link below (labeled DTV/TV):
Make sure you shut the TV off before screwing that connector onto the back of the TV to avoid an arc.
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