Image insertions inconsistent

Is there an ideal image size and resolution that will insert consistently and project well? I've recently installed Keynote to create a fairly simply photo slide show. When I insert photos to a slide, I'm find very inconsistent results. Sometimes nothing shows up, sometimes the image is faded or partially missing, etc. I have tried to make each photo consistent in image size and resolution, but the insertions results are not consistent. There must be something I can do to correct this.
Dual 2 GHz PowerPC G5   Mac OS X (10.3.9)   Also have Dual G4, iMac, & iBook

Is there an ideal image size and resolution that will
insert consistently and project well? I've recently
installed Keynote to create a fairly simply photo
slide show. When I insert photos to a slide, I'm
find very inconsistent results. Sometimes nothing
shows up, sometimes the image is faded or partially
missing, etc. I have tried to make each photo
consistent in image size and resolution, but the
insertions results are not consistent.
Partially answered by not using .psd files & converting files to .jpg. So far no abnormalities using jpg files. Still wonder what minimum resolution (dpi) may affect projection quality. I will find out soon.
Dual 2 GHz PowerPC G5   Mac OS X (10.3.9)   Also have Dual G4, iMac, & iBook

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    http://www.dreamweavermx-templates.com
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