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Locate the section in the handbook that deals with exposure compensation and learn to adjust your A620's exposure upwards by between 1 and 2 stops. I have FIVE different Canon cameras and I have had to do this with all of them.
Remember: your flash exposure compensation may be handled in another part of the manual and will probably need to be set separately - worth remembering.
Also...it's worth switching to Aperture Priority (Av) mode, quite often; it seems to help with outdoor shots of buildings or of people, when their backgrounds are quite bright.
I know how frustrating this can be.