Bust Mode Canon rebel xt is stuck in busy mode anyway to fix?

You can go into "exposure compensation" and lower the setting as you desire. It's the button that's half-black/half-white with a plus and minus.

In auto mode, the flash works only if it is necessary. You are saying that the flsah doesn't work in auto mode, and I assume that in other modes it's working properly. That means there is nothing wrong with the flash. So don't worry about the flash, it will fire in necessary, in full auto mode.

In creative mode I would imagine that you are required to choose the focus point. Try the arrow buttons.

You need to set your Mode Dial to one of the modes in the creative zone (i.e. one of the modes: P, Tv, Av, M or A-DEP) in order to access the AF, ISO and WB menus. Those menus are not displayed when the Mode Dial is set to one of the Basic Zone modes.
Hope this helps /Chris 

need to be aware of lighting conditions as well. if the lighting conditions are low then the shutter will slow to compensate

on top there is a buton next to the power switch which selects the drive mode and toggles between single shot, self timer and burst mode.

you can get the manual from
http://gdlp01.c-wss.com/gds/0900000274/EOSDR300DIM-EN.PDF
or
http://ics.leeds.ac.uk/icsmodsb/ay2007/COMM3610.pdf

happy snappin

maybe check the shutter speed setting.

Download a recent firmware,dude. :-)

the mirror is problem of your camera,it alway been close that why the sensor is functioning properly cause that sensor is working in af mode....check the post at the side of the mirror if not broken and the spring of the mirror if not dislocated....doing this you should removed the lens from the body......

According to the Canon feature chart I have here; the 540EZ Speedlite flash is not compatible with the Digital Rebel XT in ETTL mode. The 480EG is also not compatible. The 550 or any of the others in that product line are would work. David Millier Advance Camera Repair