How do i turn my camera on or off. Canon EOS rebel X 35 mm

Yes.

Follow the illustrated instructions beginning on page 27 of the manual.

In manual mode you should be able to change the shutter speed simply by turning the main dial (the thumbwheel located near the shutter release button).

When you remove the lens, where is the mirror...up or down? Fire off a few shots and watch the mirror movement.

The Rebel K2 has the Canon EF mount. It is compatible with any EF lenses except the EF-S series. It will also work with third-party lenses that are compatible with the Canon EF series.

You can see the entire current line of Canon lenses (including the EF-S series) at
http://www.usa.canon.com/cusa/consumer/products/cameras/ef_lens_lineup

shutter problem, cut off is part not exposed,replace the shutterunit.

Yes, all 35 mm lens should work on canon's digital slr cameras

Check your exposure compensation. It really sounds like someone set the camera to underexpose. This may be solved by removing the batteries for a few minutes. Other solutions are hitting the reset which will cancel all and return it to factory settings OR navigate to the exposure compensation settings and reset it there. If none of these solutions work, then the camera's internal program is messed up and its internal computer needs replaced.

All Canon EOS cameras (including the film Rebels and the digital Rebels) can use the same EF lenses.

There are some Canon lenses named EF-S that will only work with recent models of Canon digital SLR cameras, but EF lenses will work with all Canon digital SLRs.