camera problem

[Desert Fox]

Dear all,

my 7D was working perfctly until this morning whenever i pop up the built in flash the camera switches off automatically, i try to switch the camera back on but it wont, only when I remove the battery and put it back in the camera turns on.. the battery died, even after i charged it, immediately after i put it in the camera it died. i got a second one fully charged but the pop up flash problem is still on..

please help...