"Grains don't grow up to be chips, son"
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there's your problem.I tried to depress the "post pin" and could do on the gas one but not the beer one
If you cant depress the pin in the centre of the beer out post, you'll never get beer out. That pin is the "poppet".
De-gas keg completely, remove the beer out post and disassemble it. Check the poppet for an obstruction. If not use for a while, and not cleaned before being stored, those little poppet valves can get all gummed up.
Use a screwdriver and a fair bit of downward force to push the poppet down through the post to disassemble.
Clean, reassemble, re-gas, pour a pint.