USB supplies power. Mouse works, but drives do not. What do I do?

White Macbook mid-2007, OS 10.7.5
About a year ago, iSight randomly stopped working while mid-skype call.
iSight is not recognized, and Photobooth and Skype both display that there is no camera connected.
Tried resetting SMC and NVRAM, but neither worked. Gave up immediately since iSight not working was not a huge issue at the time.
Later realized USB ports would not longer read USB drives, but could just LAN sync with Dropbox, so again was not a big issue.
Searched around a lot for fixes, but basically seemed that the logic board was in need of replacement and had no plans to replace it, so gave up.
However, recently discovered that plugging in either a wired or wireless logitech USB mouse actually works.
If a mouse works, why do drives not work?
Plugging in certain drives will blink the LEDs but no drive appears in Finder or Disk Utility.
iSight still does not work, and in System Information, under the USB High-Speed Bus header, there is neither a triangle to expand the listing nor is there anything below it.
I've searched for hours and haven't seen anyone post about a similar problem, so I finally posted asking for help.
Anyone have any ideas? I had just written it off as a lost cause, but discovering that USB mice still function perfectly has made me wonder if it's still fixable.

this question has been answered in another forum - i didn't have file sharing turned on for both computers.

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