Quote:
Originally Posted by sbtm
The camera was obviously on the P mode.
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That could be the problem.

I'd suggest trying it with the camera in Manual mode.
Confusing though this can be, even if the camera is set to Manual, the flash exposure is still automatic. As long as the flashgun is set to ETTL, flash exposure is determined by a brief pre-flash, and the intensity depends on the aperture and ISO setting.
For starters, try using an aperture of about f/8 and any shutter speed you like up to the X-sync speed. The wider the aperture and the slower the shutter speed, the more ambient light will contribute to the shot. If you're bouncing the flash, quite a lot of its power is dissipated, so you may need ISO 200 or even 400 depending on how far away you are from the subject.
Give it a go!