Wont take Picture
Check for the obvious -- shutter speed, aperture, and ISO set appropriately to give you a well-exposed image, and lens caps off. If none of those are the problem, then there's a problem with the mirror, the shutter, or the sensor itself. You can carefully look inside the mirror box with the lens removed, and see if anything is blocking the motion of the mirror. If you don't see anything (or, honestly, if you do), take it to a trusted camera shop or call Olympus's repair center.