I'm not surprised... its a yongnuo what else can we expect

I know so many people who have burned their YN speedlites whether by regular use or strobist style.
I recommend you stay away from this brand. There's just too many incidents already. Chip and Godcode are both YN users, they burned their speedlites too. Try nissin, sunpak,sigma or vivitar but if the budget permits, get one that's the same brand as your camera.
FYI: I'm a nissin di622 user - canon mount and [b]modified for use with RF triggers[/b[. I'm very pleased with this flash but I'm working on getting a canon 430 ex II. Your camera works best with same brand speedlites.