Best Buy does offer camera repair.
Although our in-house Best Buy Service Centers do some repairs, the majority of repairs are completed by Precision Camera Repair. We are set up with a "Direct to Vendor" model (DTV), which allows us to UPS the customers unit directly to Precision, who when completed, will UPS the camera directly to the customers house. The average turn-around-time (TAT) for the repair from when the customer drops off the camera until it arrives back at there house is 7 days. This applies to all cameras under Manufacturers Warranty as well as PSP. We also repair out of warranty cameras that should enjoy the same TAT, if the estimate is approved promptly.

It could be several things including a bad cable. So let’s start there. Try a different cable and plug it into a different USB port. I you still have a problem this pretty much rules out that it is the cable. The Camera will only work in certain modes with USB connection. Transferring Photos is on page 107 of the user manual. If you are running Vista please see Canon's Windows Vista Support page for more information. If none of this works than it is best to take it to you nearest store to be checked out.

Look for one with the biggest LCD screen, this will make it easier to see your subjects and keep the in frame while you are recording. Also a HD (High Definition) camcorder would show the detail much better than a SD (Standard Definition) camcorder. Muscle definition and tone of the horses is important to come out good on the video and the HD camcorder will bring that out. When shooting your video shoot with a High Shutter Speed. This will “Strobe” the motion keeping the image sharp and give you less motion blur. Blur will make it harder to see details.

To list which cameras have USB interface would be a very long list. USB has become a standard connection for almost ALL digital cameras. You should be pretty safe no matter what camera you choose. Just look for the features you like. If you are using Vista Operating system on your computer make sure it is Vista Certified.