Internal Memory is full??

https://www.sony.co.in/electronics/support/articles/00027303

https://www.manualslib.com/manual/836820/Sony-Cyber-Shot-Dsc-P71.html?page=1#manual

Unlike most brands/ models of cameras, the Sony CyberShot (DSC) cameras feature internal memories, (not enough to hold sufficient data). If you took a few shots before inserting the memory card, the pictures are stored in the internal memory. You can transfer/ delete those pictures by the following steps.
1. switch off the camera,
2 open the battery/ SD card slot cover and remove the SD card.
3. close the cover and switch on
4. press the display/ preview button and your picture should be visible on the screen.

You can now do whatever you want with your picture.

Does this help? Please provide some feed-back if my answers do help.

You can see the menu copy the internal memory pictures to memory stick using memory stick commands.If any more doubt watch your manual page number 23

Take out memory card, if any, from Sony DSC-S650 camera memory slot
Go to Menu, Settings and Format memory
This will delete all picture files in internal memory and refresh it for next few pictures.
Internal memory is not big to store many pictures, use memory stick in camera to store many many pictures.

Go into the Setup menu and select Copy. This will copy all images in internal memory to the memory stick.

Yes. Press the MENU button. Select Setup (the wrench icon). Select Memory Stick Tool (memory stick icon). Select Copy.

Goto srtting > storage > set primary storage as memory card.

Insert memory card in camera, power it up and go to Menu>>Copy>>OK
That will copy internal memory pictures on to memory card.

Insert memory card, press HOME >> MANAGE MEMORY and select COPY option. Camera will copy internal photo files on memory stick.

if you took the memory stick out, and took pictures, filling the internal memory, you must connect the camera to a computer with the included cable. then download as normal, as if there was a memory stick installed.

you have to remove any memory stick prior to doing this, otherwise it defaults to loading from the stick.

good luck,
Figit090