canon 550d problem

hi guys, need some help.

i have my 550d for almost 2 years, no warranty left. It happens this morning when i turned it on, i had chance to preview photos about 3 minutes, then when i turn it into shooting mode, the display suddenly shows strips and turn off. but when i look into the viewfinder it still on. then i remove the battery over and over again, the display won't light up, the shutter won't work. then i turn the mode into the Night mode, the flash still pops up, but still can't firing.
have any ideas what's wrong with my 550d?
please help.
regards.