please help - iMac USB ports only working after restart?

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hi,

iphone connect imac following restart. subsequent times, phone won't charge computer. same true flash usb drive (but not mouse adn printer constatnly work).

there way "reset" usb connections in way, work around seems hardware issue on old imac g5? ideas very appreciated :)
 

well, seems resetting vram (is it's called? held down command-option-p-r restarted) solved issue now.
 


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