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Try to use different usb port on your computer. If still not detecting the device try to use other computer then if the device will detect by other computer there is a problem with the usb port on your computer.
You have just about answered your own problem. If you can hear sound on other computers and also on TV, then the camera is sending out sound. You should be downloading the video to your laptop with a USB cable. Make sure that you use the same cable on your laptop that you used to download on other computers. In the worst case you could get a card reader with USB and remove your memory chip from the camera and load it into the Card reader. That should solve the sound loss. I have also seen a laptop that would make sound when windows opened up but would not play a music CD. You might want to test your laptop with a music cd before you buy anything!