Flash on my iPhone 4 isn't working?

I went to go take a picture yesterday, with flash, and the flash won't work. I even tried going on my flashlight app, and the light won't turn on at all. Any ideas why?

FLASH
AHAAA
SAVIOUR OF THE UNIVERSE
DUUU DUUU DU DUUUUUUUUU

The flash LED is simply not working. I had a Nokia N97 with dual flash, and one stopped working after 2 years.

Make sure it isn't set to be automatic or being used in an app.

Normally this sort of problem rises out of mechanical fault, needs to get repaired.

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