(sorry this is kind of long) Ok. I used to have the Canon 30D and loved it. But for a birthday gift my husband traded it in for me and bought the Canon 40D and eBayed my 420 flash and got the 430 one. When I had my old camera everything was great. I just put the flash on there, turned it and the camera on and took photos. Everything worked! There was no guesswork, no nothing. I am not a photographic genius, so I probably wasn't using everything to the best of their abilities, but I could take nice photos and that was all I wanted. Now nothing will work. What is the problem?? The flash will work (sort of) when the camera is set on the auto setting, but if you put it on manual the flash does nothing. Or it will flash every now and then. The flash lightening bolt doesn't show up in the viewfinder. Nothing. You can "force" it to work once by changing the mode to something different and then taking the picture, but after that it won't work again. You have to turn it off and start over. I don't think it's that the flash or the camera are broken. I'm sure I'm doing something wrong, but what? I tried reading the flash's manual, but it didn't say to do anything I wasn't already doing. You attach the flash, turn it on, put it on the option that isn't slave (can't remember what it's called now) and it should work. But it doesn't. Is there some tip or trick to getting the 40D and the 430 flash to just take pictures when the camera is set on manual mode?? This is getting so annoying that I'm actually considering either selling everything (lenses and all) on eBay or posting some ads somewhere offering to trade this camera for my old 30D. So if I can't get this to work is there anyone here who is interested in trading their 30D for a 40?? I'm being serious...this is really frustrating.