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Does the machine work in any other ways? or is it 'dead,' seemingly?
How old is the machine? and has it been moved lately?
You might need to check the connections of the machine for corrosion, if it has been in a basement for years since it was last used and usable.
Re-seating, after checking, all connections to the console, would be ideal.
Also look for a battery hatch on the underside or back side of the console, and check whether the battery/batteries under it - if there is one there on this model - have leaked or corroded or otherwise failed. If so, that would be the likely cause of the problem.
What do you think of what I just said? your thoughts and observations as to this diagnosis (since I am not there in person) would be valuable.
See if there is a reset button in a small hole or recess on the underside of the console.
If there is, press it, e.g. with a pencil eraser or similar instrument, and hold it for a few seconds.
Then I fear you will need to invest in some repair work for the replacement of some part or parts... perhaps the console itself, given that it is dead but the whole machine isn't.
If you would like I can recommend some local repairers of Gold Gym equipment to you, get their contact information for you, if you would like. Just let me know your locale by zip code or town/city and state.