Check the camera settings and make sure the flash is turned on, and that the battery is fully charged. If this doesn't resolve the issue, the flash unit is likely faulty. Replace the flash. Also check out the full Troubleshooting Guide.
We have a chance to guarantee our right to repair electronic
equipment—like smartphones, computers, and even farm equipment. This is a once-in-a-generation
chance to protect local repair jobs—the corner mom-and-pop repair shops that
keep getting squeezed out by manufacturers.
Join the cause and tell your state representative to support Right to Repair. Tell them you believe repair should be fair, affordable, and accessible. Stand up for your right to repair!