Sounds like an internal wiring circuit problem. It's strange that the screen lights up but the flash doesn't charge. You should probably get it checked by Canon.
SOURCE: Canon Speedlite 580EX
Buy the 550EX, it's cheaper
Master /or Slave = 550
Slave = other
Alexander
SOURCE: canon speedlite 430EX
Make sure it is not set to manual 'M' on the display. To get it to shoot in ETTL (Through the lens) press the mode button and it should read ETTL in the top left corner. This then means that the light is metered thorugh the lens and you are not relying on the manual settings.
Hope that helps. I had the same problem when i first got my.
By the way a brilliant all round bit of kit. I have traveled the world to some fairly extreme temps and got it wet (Rain, humidity, sea spray to deserts and serious dust) All good.
Good luck
SOURCE: Flash is acting weird...
The problem with troubleshooting is that you have to try different things to see what changes when you do something different. Try new batteries, then try another set, then connect the flash to another camera and see if you have the same results. In my opinion, I'd have to say that it's probably the flash but like anything else, you have to try different things. Try using a different flash unit to determine if it's a flash issue or a camera hot-shoe issue. Once you find the culprit, then either replace the flash (hopefully this is the issue because it's cheaper) or it may unfortunately be the body. Hope this helps... just try a few things and cancel out what's working vs. what's not working.
SOURCE: Only get one flash when using slave
Yeah you should go into the menu on your camera and see if there is anything you need to change!!
SOURCE: Canon 50D doesn't recognize new Speedlite 430EX
Check the contacts on both the camer and the lens. I usually clean mine with methylated spirits or isopropyl alcohol. I have to do this every 3 months or so as dirt or even oils from your hands can stop the contacts from working properly.
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