My father bought an USB extension cord. Good, but the metal is too close to the plastic part in the connector. Both me and him tried to push it into the USB cage, but with no effect, but side effect – we pushed 2 of 4 metal connectors (inside the cage) in 2 of 4 cages, so that no device worked in them from that moment.
We decided to disassemble the notebook, unscrewed about 20 screws and after an hour we were in (this piece is interestingly assembled). Fortunately it was correctable by pushing the connectors up inside the cages and pressing them from the back (inside part of the chasis) to their default position.
NEVER try to push anything into the USB cage not even with minimal force.