The symptom that you described indicates that the issue with your camera is mechanical, most likely a failed part. There are few things that you can try without voiding the warranty. I will list those below.
If the camera will allow it, perform a "two button" reset using the instructions on page 58 of your manual
Next, if no improvement, remove the lens, memory card and battery, set the mode dial to M (manual), and switch the camera to the ON position. Allow the camera to sit idle for 20 minutes. Then, switch the camera to OFF, re install the battery, memory card and lens, switch it on and try to fire the shutter while still in M (manual) mode. If the error is still present, remove the lens, put the camera in manual and while observing the mirror press the shutter button and see if there is any movement at all.
Please let me know the result
Please keep in mind that my diagnosis & solutions provided are directly dependent on the accuracy of your description of the problem. As with any "do it yourself" fixes, success is a "team effort", since I can't see or touch the camera, and relies on the customer's manual dexterity and ability to follow the instructions well.
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