If the built-in flash does not function, then the camera flash may be turned off or it is set to Auto and will only flash when taking pictures in poorly-lit environments. To turn on the flash so it works regardless of lighting, press the flash button on the camera (or touch-screen LCD, if equipped) until the forced flash (aka fill-flash) icon appears on the LCD screen. The flash button has a lightning bolt symbol on it or next to it similar to the image below; it may be part of the control dial if your camera has one.
IMPORTANT: If the flash is already set to On and it is still not working, then the issue may be due to another camera setting. Even if the flash setting is On, the flash will still not work in the following circumstances:
- When shooting MPEG movies
- When shooting in these modes: Twilight, Handheld Twilight, Burst, Multi Burst, Fireworks, High Sensitivity, Night Scene, Anti Motion Blur, Continuous Shooting, Bracket
- Shooting with Sweep Panorama
- If an external flash is connected
- If the flash unit needs to be manually raised.
- After taking a photo, the built-in flash will need to recharge before another picture can be taken.
NOTE: The settings listed above are not available on all Sony® cameras. For model-specific information about your camera, refer to the instruction manual. Manuals are posted on your model support page.
The information above should resolve your issue. However, if the issue still persists you can try resetting the camera to factory specifications . Otherwise, service may be required.  Go to Product Repair.