Hello Ken, my name is Dan.
I will do my best to help you, the only stupid question is the unasked one.
The answer for that is"
A tiny switch in the headphone port is stuck in the open position.
There are a limited number of ways to fix this.
Look inside the headphone port and see if there is a red light, if so then the switch is stuck.
The first (this usually works) is to use a headphone plug like what is on the end of headphones, plug it in and out and maybe wiggle it (GENTLY). Do that and try the sound. If it now works, problem solved, if not try again.
If that should fail then take it to an APple store, a tech will repeat that process and may be successful if you were not.
If that totally fails then the only other fix is logic board replacement.
There are no other ways, sorry. The above works 99% of the time.