alert service mode jumper is set

• I have had this now for nearly 2 years, it happened one week after service care came to an end!!

The first message is "The hardware jumper is removed to override the system password setting. System password has been erased and password cannot be changed. Please connect the hardware jumper to perform any password changes."

I have to press F1 due to "alert service mode jumper is set".

I have tried different jumper positions but PC never shuts down if I change it and this is the only way to start it up and shut down.

Once running it works just as it should.

Any help would be most appreciated...