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				Saber Cherry said: 
 
 
It's possible you have bad USB ports, a defective motherboard, or a defective drive.  .  
			
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 I haven't had trouble with my usb ports till now. I run my modem, camera and scanner out of them. I wonder if perhaps it can't use them since they are devoted to what I already have, but the modem and scanner share the same port with no trouble, except I have to swap leads depending on what I use.