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What you require is to format the Compact Flash Card. The CF card should be formatted when new and after every download. Format the card in the camera it is going to be used it. Constantly deleting pictures on the memory card will cause major corruptions and total failure. Formatting cleans the memory and allows the camera to communicate properly with the CF Card. I going to give you several diagrams on where to go in your camera to format. these diagrams are screen shots right from your manual.
No camera flash can operate in video mode. It would have to flash 15 or 30 times a second. It takes longer than a second for the flash circuitry to charge up each time.
You can get a separate lighting unit for video which provides constant illumination. This does not require any connection to the camera, it just provides light, and the camera will adjust exposure automatically as usual.
It can be that your batteries are low and takes longer to charge the flash... It can also be that your memory card is a slow on. If the red processing light on the back of the camera is staying on a long time, it means the camera is having trouble feeding the picture to the card... You might try decreasing the picture quality a little...
Hmmm... doesn't sound too good does it? Have you tried another CF card? I know you said it doesn't work even without a card but...
Also one last thing to try is to tkae out both batteries, the main one and the slim watch style backup battery that sits right next to the main one under the cover labelled CR2016. Leave them both out for an hour and see what happens. NOTE this will probably reset your camera to factory defaults and may reset the photo numbering counter back to zero. Worth a try?
Have you been taking shots in continuous mode (burst)? The camera has a built in buffer of fast memory where photos are stored before being written to the slower CF card. Once the memory gets full the camera will not take another picture unless some of the images complete transfer to the CF card. You will notice a number inside your viewfinder (bottom left) the number goes down when you take a picture that is how much space is left in the buffer when it hits 0 the buffer is full it will go up as the buffer clears. Note that RAW takes up more space and fills the buffer quickly.
If you get the "Busy" message even after just 1 shot then there is something wrong with either your CF card or your camera and you should take try another card or it to canon for service.