I have a question about my Canon 600d camera display. I got the camera two weeks ago and everything was working perfectly. I was taking photos through display and there was no problem. But today, when I tried to take photo through the display (I am mostly using manual mode), the display stayed black all time. The display is working normaly with all icons and in video-taking mode, but when I try to take a photo using display it is not working.I tried to delete the settings, turn it on and off...but I am desperate right now. Thank you for your answers.
In order to use the rear LCD to compose pictures (as opposed to using the optical viewfinder), you must put your camera into "Live View" mode. On the 600D (and all other recent Canon SLRs), this is done by pressing the button marked with a camera icon and a red dot which is just to the right of the viewfinder:
It is worth noting that using the rear LCD rather than the optical viewfinder to compose pictures can remove some of the advantages of using an SLR - this question gives a good overview of the differences.