Trouble with 50D built in flash

I'm having difficulties with my camera. When I push the button to pop up my flash, nothing happens. It does not come up. When I go to menu>flash control>built in flash func. setting, I get "This menu cannot be displayed.
External flash is attached." Obviously I can see that my 580 is not mounted. What could this be? Am I missing something obvious? Thanks in advance.

-Dale

Did you remember to turn off the camera after the flash was mounted/unmounted?

Don't remember, so probably not. What do i do now?

Check the micro-switch in the hotshoe, on the right side when viewed from the rear. I manually pushed mine down and I get the same exact message when trying to access built in flash settings.

Jaymz wrote in post #8142140
Check the micro-switch in the hotshoe, on the right side when viewed from the rear. I manually pushed mine down and I get the same exact message when trying to access built in flash settings.

Thank you. That's what's happening. It wasn't "lifting" high enough. If I manually lifted it up, the flash would pop up. I appreciate your help!