Of course you know that the Mac's iPhoto tool is pretty awesome, so I won't dwell.
On the PC try a reboot.
On my PC when I attach a USB device I get a little
chime, so make sure that your system is recognizing a USB device.
Next stop Control Panels/ System/ Hardware Tab/ Device Manager look for the little (!) icon next to your USB controller, might be a conflict.
Also make sure you have the latest drivers from your camera manufacturer.
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