USB MALFUNCTION?? unable to recognize device- desktop manager

I am unable to sync and backup my blackberry as i cant connect the device to the laptop. I have purchased several new usb cables and none of them allow my phone to connect to the laptop, i either get a message saying that the device is unable to charge my phone or something about usb malfunction. The usb ports of the laptop work perfectly fine with everything else, just not this phone. Could it possible be because the usb/charging port on my blackberry is dodgy? its bent quite far down, i sometimes have difficulty charging my phone due to this..i've been meaning to repair it for sometime.. if its not the usb and not the usb port of the laptop, is it the phones usb port causing the problem? if not, what is the cause of the problem?
I've also reinstalled desktop manager so i doubt thats the cause

many thanks�