Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, "...cd is not playing..." but everything else is working as expected? ...such as loading, ejecting, selecting discs ?
Have you tried cleaning the laser lens? ...using a cleaning disc for such purpose similar to the products shown HERE ?
It would be inside the Panasonic. It is the electronic eye that reads the music data off the discs.
Thank you for allowing me time to compose my reply.
In the absence of a cleaner, the alternative is to open up the Panasonic for a look-n-see.
Please post back clear pictures of the insides of the disc loader carriage with the rack panel open. Click HERE.
The laser lens to attempt manual cleaning based on "...don't have s cleaner..."