If the gauge says 10 psi then it should be 10 psi at the gauge, meaning there is pressure in your tank. You can test this by turning the pressure up, what does it do? hopefully it will go above 10 psi. If no, then this is weird.
If yes, then are all your valves turned on? There is a switch on the regulator, and you need to turn it to face in line with the output, otherwise there will be no gas leaving the regulator to your keg. Also, do you have a manifold or any other valve between the regulator and the keg?
When you release the pressure release valve on the keg, does co2 come rushing out? If yes, it's pressurized. If no, there's no c02 getting to the keg.
Just a couple things to check, good luck.