Try the usual.
1. BIOS has USB enabled.
2. Motherboard and USB drivers are installed.
That and more at http://www.usbman.com
I'd comment more about the motherboard drivers, but your post didn't note the make/model of the host machine.
bob
I'm trying to connect my printer HP7350 and digital camera to my computer windowsME but the computer cannot detect either one even though the usb cords have been connected. I'm computer illiterate and don't know what to do.

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