Try resetting the camera to factory defaults - Here's how:
Firstly press the 'menu' button, then the up
button above the 'OK' as many times as needed, until you see the top
folders are highlighted.
the right button near the 'OK' until you see the last folder
highlighted. You will know this is highlighted when you see the first
menu option that says 'Language'. The 3rd one down from that says
Press the down button under the 'OK' until 'Clear Settings' is highlighted, then press the 'OK' button.
Scroll up to your choice and press 'OK' to reset your Canon 400D back to default factory settings.
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Assuming it finally goes off. The camera is busy saving the image to memory. You may try faster memory cards to shorten the wait time. You may also need to save all your images to your computer then re-format the card in the camera.
It sounds like it is busy trying to transfer data from the buffer to the memory card. Have you tried either 1) saving the contents and then formatting the memory card in the camera or 2) installing a different memory card? One of those options should work.
Consider NOT connecting your camera to your computer.
The best way to download pictures from your camera to your computer involves removing the memory card from the camera and plugging it into a card reader (either built-in to the computer or connected via USB or FireWire). This is likely to be faster than connecting the camera to the computer, and won't run down your camera's batteries.
Once the card is plugged in, it will appear to your computer as a removable drive. You can use the operating system's drag&drop facility to copy pictures from the card to the computer's hard drive, the same way you copy any other files. Or you can use any photo cataloging program such as Nikon Transfer.
Try to plug into a different USB port. If that does not help then go to Control panel->systems-> hardware tab-> device manager->and now try to see if your Camera appears under the options listed (would be under Scanners and Camera, Click on every + sign to see)