Since you didn't provide brand and model info - only generic help can be given.
Most cameras will automatically turn the flash on when conditions are too dark for a successful exposure. Many times, the camera will not allow you to take the picture if the flash can't be turned on. You'll have to go through the menu settings of the camera to find a Flash Setting. Popular choices are often Always Flash, Never Flash, Red Eye Reduction and Automatic Flash. It sounds as if the setting was changed to Never Flash - or the flash bulb itself has failed.
If you have problems still - provide the manufacturer and model camera you're using and I'll see if I can find out how to do it for you. Good luck!
folloe these steps
camera<settings <Flash< turn it on . or camera<more<flash<turn it on
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