Why won't the flash on my Canon T2i pop up?

There could be several reasons why the flash on your Canon T2i won't pop up. It could be due to a mechanical issue, a setting in the camera menu, or the flash being disabled. Check the flash settings in the camera menu, make sure the flash is enabled, and try gently pushing the flash button to see if it will pop up. If the issue persists, it may require professional servicing.