EOS Rebel T3i suddenly not recognized by computer?

Suddenly my computer wont recognize my camera as a device, it's like it's not even plugged in at all. 
It's not the USB, it's not the cord, it's not the computers because I've tried different ones of bothn tems,. I turn on the camera after plugging it in and it just turns on as if to take a photo.
I've tried unplugging it, resetting the computer, turning it off and on and nothing worksl.
The EOS utility download doesn't work.
I've tried it on Windows 7 and Windows Vista

Hi abc123! Thanks for posting. When the camera is connected and powered on, do you hear a noise from the computer indicating a connection has been made? Does the computer show the camera at all in the Device Manager?  To check, click the Start button, type Device Manager and press Enter. Is your computer a laptop? What USB port on the computer are you connecting it to? If this is a time sensitive-matter, additional support options are available at Contact Us.  

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