A 20pin keyboard connector inside a keyboard. It's sitting next to the port it's supposed to connect to, not connected in the slightest.
https://digipres.club/system/media_attachments/files/113/648/693/449/989/380/original/973693fbe5a32f1d.jpg
Completely disassmbled the left half, no issues found.
Opened right half and... WELL THERE'S YOUR PROBLEM!
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