I have used my Canon 430EX speedlite both on camera and off (using radio poppers when off). Recently I found out that I could use my speedlite wireless with the Canon 7D and did some senior pictures this way. I am now trying to use the flash on camera again and it is not firing. I reset my flash settings in the camera, but it still doesn't work. I have replaced the batteries, but it still doesn't work. Any suggestions? Thanks!