hello, has anyone had any problesm with the onboard flash failing on their rebel xti?? my camera will be a year old in febuary, and ive only used an external flash a couple times, one of the externals i used was about 8 months ago was a jessop, i checked to see what the fireing voltage was before i used it and it was only 6 volts so i cant see that hurting anything, and then i used a borrowed 430 ex a little while ago, just wonderingi f its a common problem or not??

