It is your camera using the flash to assist in focusing, if it bothers you you can change it in your menus, I have a XTi so yours will differ slightly. Switch your camera to "P" mode. Press "Menu" button. Go to setup menu 3 scroll down to "Custom Functions (C Fn.)" Press "set". press to the right until you find "AF - assist beam" Press "set". And press up or down. Set to "Does not emit" press "set" Press "menu" button twice.
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Does the flash fire? If it fires when closed then it is a mechanical issue with the release mechanism. Probably got something jamming the release. Unfortunately this requires opening the camera. Best to consult your nearest canon dealer if your not confident enough to try yourself.
Most Canon DSLRs have a switch in the hot shoe (if you look under the spring plate in the hot shoe one one side there is usually a small white shaft sticking up from underneath the top cover). Sometimes because of spillage etc. this shaft sticks down and the camera thinks that there is an external flash installed so it won't operate the built in flash. In your case I would be more suspicious of the flash board. Does the flash symbol in the viewfinder light up? When you fire the camera does the symbol go out but the flash doesn't fire? This is a pretty common sign of a bad flash board. A third possibility would be a broken flash tube. Has the camera been impacted? Put the camera's mode dial on 'P' and push the flash button on the side of the mount/front cover. Does the flash pop up? Does it fire now? On the P,A,S,M setting the flash fires all the time if it is popped up; if it is one the green rectangle or other setting it only fires if there is not enough light. Finally reset the menu to factory default in case something is selected that is causing the flash not to fire.
Flash should pop up automatically when you operate camera in easy mode (green square on dial selector) in low light conditions. If using in manual modes press the button on the left side of the lens mount. To fire the flash without taking a picture press the button used to zoom out when viewing pictures. If your flash does not work at all then there is probably a fault with the charging circuit or firing circuit.
I assume that flash is turned on. 430ex flash will fire automatically only in AUTO mode. On manual modes you mus manually force the flash to fire. If flash doesn't fire at all, consider to claim the vendor or let the vendor to check the flash mounted on your camera.