Did you format the new memory card? If not start by doing that in camera using the menus to see if that goes well. If so forget Live View & try taking a photo in the conventional way using the viewfinder in Program mode. If that works move to the other modes to see if they work properly. Also note that in Live View you MAY have to set the lens to MF (check the manual on that) but for the tests I've suggested it should be in AF.
What brand and type of SD card are you using? Make sure you use quality cards
Did the camera actual format the card or did it choke while doing so?
Try a full format of the card first from your PC, then put it back in the camera and format it again. If that doesn't work try a different SD card
If all else fails, call Canon support, they do an excellent job.
Just did a quick google for Err 20:
Err 20 - Malfunctions related to the mechanical mechanism have been detected.
Pull the batteries for a while to see if things will reset then try again.
If the above does not work, return the camera.