May need the built-in flash on K5 at my niece's wedding on Friday night, so trying it out, but simply could not get it to pop up. This is the first time I am using a built-in flash. Read the manual the whole morning but never indicate why? I have my FA 31 Ltd on, set to Av mode, ISO 400, f5.6. Press the flash button, nothing happens. Can anyone help this Pentax noob.