Starter will not stop dash lights coming on nor any other electrical items from working.
The solenoid seizing will simply stop your car from cranking over.
So, if you still have power, radio works, lights work etc but the car will not turn over then yes most likely the solenoid.
Bitch to replace in a driveway (I know I had to replace mine and that top bolt is a ****) but not hard.
If your radio and lights don't work and it still wont crank over then there is something else wrong with it