Macbook won't recognize iomega back-up drive or camera.

Suddenly, my Macbook will no longer recognize my iomega back-up hard drive or my Canon camera in either USB port.  It does, however, recognize a flash drive I use in either port. 
When I try to do an iomega back up, I get a message that reads: "Time Machine could not complete the  backup.  The back up disk is not available."
Any suggestions as to what the problem is?

Hey lkmk52,
I'd take a look at the following article and go through the "Top troubleshooting tips" section to see if that helps the MacBook recognize those devices again:
USB and FireWire Quick Assist
http://support.apple.com/kb/HT1151
Hope that helps,
David

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