Looking from the back of the camera, look at the sliders where the hot shoe speedlight would fit in, there should be a small pin it could bet stuck down take a very small screwdriver and move the slider down and up to release the pin. If this does not work it will have to go to Canon,
The pin on the hotshoe slider is probobly stuck down if you look from the back of the camera at the hotshoe slider at the right hand side where the speedlight slides in there should be a pin stiching up. just with a very small screwdriver move the slide up & down if that does not work then it will have to go to Canon.
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SOURCE: built-in flash
do you get an error message? if yes the screws which are on the sides that hold the stainless steel slider bars could be missing the nylon spacer shims. a common fault
SOURCE: Canon 450D, ERROR 99 only when flash pops up
Err 99 usually means your lens contacts are dirty either on the lens itself or on the camera.
To isolate the cause of the issue, do the following: -
1. Turn off the camera.
2. Remove the lens, battery, and CF card.
3. Allow the camera to sit without power for approximately 20 minutes.
4. Insert only a fully charged battery, and turn on the camera.
5. Depress the shutter button as you would to take a picture.
Does the “ERR 99" message appear? If so, the camera may be faulty and requires a service. If it does not, then: -
1. Turn off the camera.
2. Insert the CF card.
3. Turn on the camera.
4. Format the CF card in the camera.
5. Depress the shutter button as you would to take a picture.
Does the “ERR 99" message appear? If so, then the CF card is faulty. Try a different card. If the message does not appear: -
1. Turn off the camera.
2. Clean the gold contacts on the lens by GENTLY rubbing them with a pencil eraser or soft cloth. Keeping the camera face pointing down, also clean the gold contacts on the camera, being careful that you do not let any debris fall into the camera body.
3. Reattach your lens.
4. Turn on the camera.
5. Depress the shutter button as you would to take a picture.
If the “ERR 99" message only appears when one particular lens is attached, then that lens should be examined by a service technician.
If you see the “ERR 99" with a different Canon lens attached, then the camera is faulty and should be serviced.
SOURCE: The built-in flash on my Canon EOS 450D camera won't pop-up
Had the same issue and just tried this....and it worls [PS dont use the littel plastic hotshoe cover as this keeps the microswitch depressed]
Originally Posted by Tdragone 
If you manually 'help' the flash to open and it doesn't pop; the microswitch under the rails of your hotshoe is probably stuck in the down position as mine was. I used a toothpick top pop it up and it works now!
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